Merge pull request #1904 from presidentbeef/relax_prism_version

Relax Prism version requirement

Author: presidentbeef

gem_common.rb

@@ -22,7 +22,7 @@ def self.extended_dependencies spec
       spec.add_dependency "haml", "~>5.1"
       spec.add_dependency "slim", ">=1.3.6", "< 5.3"
       spec.add_dependency "rexml", "~>3.0"
-      spec.add_dependency "prism", "~>1.3"
+      spec.add_dependency "prism", "~>1.0"
     end
   end
 end