Issue 108: Prepare for 0.6.1 release (#109)

* Updated Pravega and Connector version to 0.6.1
* Updated Pravega sub-module commit to v0.6.1

Signed-off-by: Brian Zhou <[email protected]>

gradle.properties

@@ -21,15 +21,15 @@ shadowGradlePlugin=2.0.3
 slf4jApiVersion=1.7.25
 
 # Version and base tags can be overridden at build time.
-connectorVersion=0.6.1-SNAPSHOT
-pravegaVersion=0.6.0
+connectorVersion=0.6.1
+pravegaVersion=0.6.1
 
 # flag to indicate if Pravega sub-module should be used instead of the version defined in 'pravegaVersion'
 usePravegaVersionSubModule=false
 
 # These properties are only needed for publishing to maven central
 # Pravega Signing Key
-signing.keyId=05949AF6
+signing.keyId=
 # gpg password is required when signing
 # signing.password=
 # This will be defaulted to ~/.gnupg/secring.gpg if not provided as a command line property