manually bump development version (#288)

diff --git a/arrow-flight/Cargo.toml b/arrow-flight/Cargo.toml
index ba92f4f..c6027f8 100644
--- a/arrow-flight/Cargo.toml
+++ b/arrow-flight/Cargo.toml
@@ -18,7 +18,7 @@
 [package]
 name = "arrow-flight"
 description = "Apache Arrow Flight"
-version = "4.0.0-SNAPSHOT"
+version = "5.0.0-SNAPSHOT"
 edition = "2018"
 authors = ["Apache Arrow <dev@arrow.apache.org>"]
 homepage = "https://github.com/apache/arrow-rs"
@@ -26,7 +26,7 @@
 license = "Apache-2.0"
 
 [dependencies]
-arrow = { path = "../arrow", version = "4.0.0-SNAPSHOT" }
+arrow = { path = "../arrow", version = "5.0.0-SNAPSHOT" }
 tonic = "0.4"
 bytes = "1"
 prost = "0.7"
diff --git a/arrow-pyarrow-integration-testing/Cargo.toml b/arrow-pyarrow-integration-testing/Cargo.toml
index d9ccc58..34d2435 100644
--- a/arrow-pyarrow-integration-testing/Cargo.toml
+++ b/arrow-pyarrow-integration-testing/Cargo.toml
@@ -18,7 +18,7 @@
 [package]
 name = "arrow-pyarrow-integration-testing"
 description = ""
-version = "4.0.0-SNAPSHOT"
+version = "5.0.0-SNAPSHOT"
 homepage = "https://github.com/apache/arrow-rs"
 repository = "https://github.com/apache/arrow-rs"
 authors = ["Apache Arrow <dev@arrow.apache.org>"]
@@ -31,7 +31,7 @@
 crate-type = ["cdylib"]
 
 [dependencies]
-arrow = { path = "../arrow", version = "4.0.0-SNAPSHOT" }
+arrow = { path = "../arrow", version = "5.0.0-SNAPSHOT" }
 pyo3 = { version = "0.12.1", features = ["extension-module"] }
 
 [package.metadata.maturin]
diff --git a/arrow/Cargo.toml b/arrow/Cargo.toml
index e6773d9..d66ac25 100644
--- a/arrow/Cargo.toml
+++ b/arrow/Cargo.toml
@@ -17,7 +17,7 @@
 
 [package]
 name = "arrow"
-version = "4.0.0-SNAPSHOT"
+version = "5.0.0-SNAPSHOT"
 description = "Rust implementation of Apache Arrow"
 homepage = "https://github.com/apache/arrow-rs"
 repository = "https://github.com/apache/arrow-rs"
diff --git a/integration-testing/Cargo.toml b/integration-testing/Cargo.toml
index 7580a8c..af97787 100644
--- a/integration-testing/Cargo.toml
+++ b/integration-testing/Cargo.toml
@@ -18,7 +18,7 @@
 [package]
 name = "arrow-integration-testing"
 description = "Binaries used in the Arrow integration tests"
-version = "4.0.0-SNAPSHOT"
+version = "5.0.0-SNAPSHOT"
 homepage = "https://github.com/apache/arrow-rs"
 repository = "https://github.com/apache/arrow-rs"
 authors = ["Apache Arrow <dev@arrow.apache.org>"]
diff --git a/parquet/Cargo.toml b/parquet/Cargo.toml
index bda23ef..fc221b0 100644
--- a/parquet/Cargo.toml
+++ b/parquet/Cargo.toml
@@ -17,7 +17,7 @@
 
 [package]
 name = "parquet"
-version = "4.0.0-SNAPSHOT"
+version = "5.0.0-SNAPSHOT"
 license = "Apache-2.0"
 description = "Apache Parquet implementation in Rust"
 homepage = "https://github.com/apache/arrow-rs"
@@ -41,7 +41,7 @@
 zstd = { version = "0.7", optional = true }
 chrono = "0.4"
 num-bigint = "0.3"
-arrow = { path = "../arrow", version = "4.0.0-SNAPSHOT", optional = true }
+arrow = { path = "../arrow", version = "5.0.0-SNAPSHOT", optional = true }
 base64 = { version = "0.12", optional = true }
 clap = { version = "2.33.3", optional = true }
 serde_json = { version = "1.0", features = ["preserve_order"], optional = true }
@@ -54,7 +54,7 @@
 flate2 = "1.0"
 lz4 = "1.23"
 zstd = "0.7"
-arrow = { path = "../arrow", version = "4.0.0-SNAPSHOT" }
+arrow = { path = "../arrow", version = "5.0.0-SNAPSHOT" }
 serde_json = { version = "1.0", features = ["preserve_order"] }
 
 [features]
diff --git a/parquet/README.md b/parquet/README.md
index 6abbbc7..836a23b 100644
--- a/parquet/README.md
+++ b/parquet/README.md
@@ -23,7 +23,7 @@
 Add this to your Cargo.toml:
 ```toml
 [dependencies]
-parquet = "4.0.0-SNAPSHOT"
+parquet = "5.0.0-SNAPSHOT"
 ```
 
 and this to your crate root:
@@ -44,7 +44,7 @@
     println!("{}", record);
 }
 ```
-See [crate documentation](https://docs.rs/crate/parquet/4.0.0-SNAPSHOT) on available API.
+See [crate documentation](https://docs.rs/crate/parquet/5.0.0-SNAPSHOT) on available API.
 
 ## Upgrading from versions prior to 4.0
 
diff --git a/parquet_derive/Cargo.toml b/parquet_derive/Cargo.toml
index 732957d..1d16137 100644
--- a/parquet_derive/Cargo.toml
+++ b/parquet_derive/Cargo.toml
@@ -17,7 +17,7 @@
 
 [package]
 name = "parquet_derive"
-version = "4.0.0-SNAPSHOT"
+version = "5.0.0-SNAPSHOT"
 license = "Apache-2.0"
 description = "Derive macros for the Rust implementation of Apache Parquet"
 homepage = "https://github.com/apache/arrow-rs"
@@ -39,4 +39,4 @@
 proc-macro2 = "1.0"
 quote = "1.0"
 syn = { version = "1.0", features = ["full", "extra-traits"] }
-parquet = { path = "../parquet", version = "4.0.0-SNAPSHOT" }
+parquet = { path = "../parquet", version = "5.0.0-SNAPSHOT" }
diff --git a/parquet_derive_test/Cargo.toml b/parquet_derive_test/Cargo.toml
index 0a4c2de..25c814b 100644
--- a/parquet_derive_test/Cargo.toml
+++ b/parquet_derive_test/Cargo.toml
@@ -17,7 +17,7 @@
 
 [package]
 name = "parquet_derive_test"
-version = "4.0.0-SNAPSHOT"
+version = "5.0.0-SNAPSHOT"
 license = "Apache-2.0"
 description = "Integration test package for parquet-derive"
 homepage = "https://github.com/apache/arrow-rs"
@@ -28,5 +28,5 @@
 publish = false
 
 [dependencies]
-parquet = { path = "../parquet", version = "4.0.0-SNAPSHOT" }
-parquet_derive = { path = "../parquet_derive", version = "4.0.0-SNAPSHOT" }
+parquet = { path = "../parquet", version = "5.0.0-SNAPSHOT" }
+parquet_derive = { path = "../parquet_derive", version = "5.0.0-SNAPSHOT" }