bump-revision: fix for new license syntax

Library/Homebrew/dev-cmd/bump-revision.rb

@@ -40,10 +40,12 @@ module Homebrew
         end
 
         old = if formula.license
-          license_string = if formula.license.length > 1
+          license_string = if formula.license.is_a? String
-            formula.license
+            "\"#{formula.license}\""
           else
-            "\"#{formula.license.first}\""
+            formula.license.to_s.gsub(/:(\w+)=>/, '\1: ')                   # Change `:any_of=>` to `any_of: `
+                   .tr("{}", "")                                            # Remove braces
+                   .gsub(/=>with: "([a-zA-Z0-9-]+)"/, ' => { with: "\1" }') # Add braces and spacing around exceptions
           end
           # insert replacement revision after license
           <<~EOS