refactor(deps): use shorthand github refs (#608)

Shortens longhand GitHub references in `package.json` to use npm's shorthand notation. This also fixes a problem with Renovate, where ssh-only dependencies are not currently supported (e.g. see #567). Using shorthand means npm/yarn try http first and succeed in updating the lock files.

packages/graphql-playground-react/package.json

@@ -79,7 +79,7 @@
     "postcss-cssnext": "2.11.0",
     "postcss-flexbugs-fixes": "3.3.0",
     "postcss-import": "9.1.0",
-    "postcss-inherit": "git+https://github.com/timsuchanek/postcss-inherit#build3",
+    "postcss-inherit": "timsuchanek/postcss-inherit#build3",
     "postcss-inject": "1.0.1",
     "postcss-loader": "2.0.10",
     "postcss-nested": "1.0.1",
@@ -120,7 +120,7 @@
     "calculate-size": "^1.1.1",
     "classnames": "^2.2.5",
     "codemirror": "^5.27.4",
-    "codemirror-graphql": "git+ssh://git@github.com/timsuchanek/codemirror-graphql.git#details-fix",
+    "codemirror-graphql": "timsuchanek/codemirror-graphql#details-fix",
     "copy-to-clipboard": "^3.0.8",
     "cuid": "^1.3.8",
     "graphcool-styles": "0.2.7",
@@ -165,7 +165,7 @@
     "seamless-immutable": "^7.0.1",
     "styled-components": "^3.1.6",
     "styled-jsx": "^2.2.1",
-    "styled-jsx-postcss": "git+https://github.com/timsuchanek/styled-jsx-postcss#build3",
+    "styled-jsx-postcss": "timsuchanek/styled-jsx-postcss#build3",
     "styled-theming": "^2.2.0",
     "subscriptions-transport-ws": "^0.9.5",
     "utility-types": "^1.0.0",