bump in bump-0.6.1

- old
+ new

@@ -6,9 +6,10 @@
   opts.banner = <<BANNER
 Bump your gem version.
 
 Usage:
     bump current    # show current version
+    bump file       # show version file path
     bump pre        # increase prerelease version of your gem (1.0.0-X) [alpha, beta, rc, ]
     bump patch      # increase patch version of your gem (1.0.X)
     bump minor      # increase minor version of your gem (1.X.0)
     bump major      # increase major version of your gem (X.0.0)
     bump set 1.2.3  # set the version number to the given value