message: refactor(deps): use shorthand github refs
  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 Using shorthand means npm/yarn try http first and succeed in updating the lock files.
diff: "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",
  "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",
  "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",
  