cmd/geth: changed version number to 1.2.0

Changed the version number of geth to 1.2.0 so that dev builds are now properly build (instead of master). Note to self; increase version number to 1.2.1 for our next actual release.

cmd/geth/main.go

@@ -48,9 +48,9 @@ import (
 
 const (
 	ClientIdentifier = "Geth"
-	Version          = "1.1.0"
+	Version          = "1.2.0"
 	VersionMajor     = 1
-	VersionMinor     = 1
+	VersionMinor     = 2
 	VersionPatch     = 0
 )