Fix elixir :logger warnings

Migrate deprecated config option variable to new config option for :logger application. 
Fixed `warning: :compile_time_purge_level option for the :logger application is deprecated,
use :compile_time_purge_matching instead`.
diff --git a/config/integration.exs b/config/integration.exs
index ef7fad2..46cfad0 100644
--- a/config/integration.exs
+++ b/config/integration.exs
@@ -2,7 +2,9 @@
 
 config :logger,
   backends: [:console],
-  compile_time_purge_level: :debug,
+  compile_time_purge_matching: [
+    [level_lower_than: :debug]
+  ],
   level: :debug
 
 config :sasl,
diff --git a/config/test.exs b/config/test.exs
index 4e09e10..e2336a3 100644
--- a/config/test.exs
+++ b/config/test.exs
@@ -2,7 +2,9 @@
 
 config :logger,
   backends: [:console],
-  compile_time_purge_level: :debug,
+  compile_time_purge_matching: [
+    [level_lower_than: :debug]
+  ],
   level: :debug
 
 config :kernel,
diff --git a/test/elixir/config/test.exs b/test/elixir/config/test.exs
index 4b28ea9..9fe475b 100644
--- a/test/elixir/config/test.exs
+++ b/test/elixir/config/test.exs
@@ -1,3 +1,5 @@
 config :logger,
   backends: [:console],
-  compile_time_purge_level: :debug
+  compile_time_purge_matching: [
+    [level_lower_than: :debug]
+  ]