upgrade codemirror dep

package.json

@@ -22,7 +22,7 @@
     "actionsack": "^0.0.13",
     "axios": "^0.19.1",
     "cm-show-invisibles": "^3.0.1",
-    "codemirror": "^5.49.2",
+    "codemirror": "^5.50.2",
     "codemirror-graphql": "^0.11.6",
     "codemirror-mode-elixir": "^1.1.2",
     "codemirror-solidity": "^0.2.1",

yarn.lock

@@ -3020,10 +3020,10 @@ codemirror@^5.48.2:
   resolved "https://registry.yarnpkg.com/codemirror/-/codemirror-5.48.2.tgz#a9dd3d426dea4cd59efd59cd98e20a9152a30922"
   integrity sha512-i9VsmC8AfA5ji6EDIZ+aoSe4vt9FcwPLdHB1k1ItFbVyuOFRrcfvnoKqwZlC7EVA2UmTRiNEypE4Uo7YvzVY8Q==
 
-codemirror@^5.49.2:
-  version "5.49.2"
-  resolved "https://registry.yarnpkg.com/codemirror/-/codemirror-5.49.2.tgz#c84fdaf11b19803f828b0c67060c7bc6d154ccad"
-  integrity sha512-dwJ2HRPHm8w51WB5YTF9J7m6Z5dtkqbU9ntMZ1dqXyFB9IpjoUFDj80ahRVEoVanfIp6pfASJbOlbWdEf8FOzQ==
+codemirror@^5.50.2:
+  version "5.50.2"
+  resolved "https://registry.yarnpkg.com/codemirror/-/codemirror-5.50.2.tgz#32ddfe2b50193fcf573d8141c4a31d267c92b4a3"
+  integrity sha512-PPjUsC1oXSM86lunKrw609P1oM0Wu8z9rqzjbeyBYCcx44VL41aUpccdOf1PfAZtTONlmN3sT3p2etLNYa1OGg==
 
 collection-visit@^1.0.0:
   version "1.0.0"