Update README.md

Author: monkstone

README.md

@@ -58,4 +58,4 @@ jruby --dev my_sketch.rb # --dev flag speeds start-up
 [buster]:https://gist.github.com/monkstone/6ae9840d7b7008c177b4a9f589d14ec6
 [propane]:https://ruby-processing.github.io/propane/
 [vim]:https://github.com/ruby-processing/PiCrate/blob/master/docs/_editors/vim.md
-[geany]https://github.com/ruby-processing/PiCrate/blob/master/docs/_editors/geany.md
+[geany]:https://github.com/ruby-processing/PiCrate/blob/master/docs/_editors/geany.md