Merge pull request #57 from unitsml/update/removed_plurimath_branch

removed plurimath branch name

Author: suleman-uzair

Gemfile

@@ -7,7 +7,7 @@ gem "byebug"
 gem "equivalent-xml"
 gem "oga"
 gem "ox"
-gem "plurimath", github: "plurimath/plurimath", branch: "update/mathml_symbol_transformation"
+gem "plurimath"
 gem "pry"
 gem "rake"
 gem "rspec"