Update version to v1.3.1-rc.1

Author: kaidaguerre

version/version.go

@@ -17,7 +17,7 @@ var fdwVersion = "1.3.0"
 // A pre-release marker for the version. If this is "" (empty string)
 // then it means that it is a final release. Otherwise, this is a pre-release
 // such as "dev" (in development), "beta", "rc1", etc.
-var prerelease = "rc.0"
+var prerelease = "rc.1"
 
 // FdwVersion is an instance of semver.Version. This has the secondary
 // benefit of verifying during tests and init time that our version is a