MYRIAD-314 Update version to 0.5.0 (#139)

diff --git a/build.gradle b/build.gradle
index 2c76203..47cd148 100644
--- a/build.gradle
+++ b/build.gradle
@@ -66,7 +66,7 @@
     mainClassName = "org.apache.myriad.Main"
 
     group = "org.apache.myriad"
-    version = "0.3.0"
+    version = "0.5.0"
 
     ext {
         mesosVer = "1.8.0:shaded-protobuf"