Bump version to 0.10.0

Author: zoercai

build.gradle

@@ -5,7 +5,7 @@ subprojects {
     apply plugin: 'signing'
 
     group = "com.google.cloud.opentelemetry"
-    version = "0.10.0-SNAPSHOT" // CURRENT_VERSION
+    version = "0.10.0" // CURRENT_VERSION
 
     sourceCompatibility = JavaVersion.VERSION_1_8
     targetCompatibility = JavaVersion.VERSION_1_8