fix: pin babel-plugin-styled-components to 1.7.1

Author: greenkeeper[bot]

package.json

@@ -51,7 +51,7 @@
     "babel-plugin-dynamic-import-node": "^1.2.0",
     "babel-plugin-lodash": "^3.3.2",
     "babel-plugin-module-resolver": "^3.1.0",
-    "babel-plugin-styled-components": "^1.5.0",
+    "babel-plugin-styled-components": "1.7.1",
     "babel-plugin-syntax-dynamic-import": "^6.18.0",
     "babel-preset-env": "^1.6.1",
     "babel-preset-flow": "^6.23.0",