Remove unusesd packages

package.json

@@ -50,7 +50,6 @@
     "eslint": "^3.3.0",
     "eslint-plugin-import": "^2.0.0",
     "expect": "^21.0.0",
-    "gzip-size": "^3.0.0",
     "jest-mock": "^21.0.0",
     "karma": "^1.2.0",
     "karma-browserstack-launcher": "^1.0.1",
@@ -61,7 +60,6 @@
     "karma-sourcemap-loader": "^0.3.7",
     "karma-webpack": "^2.0.1",
     "mocha": "^3.0.2",
-    "pretty-bytes": "^4.0.2",
     "rollup": "^0.66.6",
     "rollup-plugin-babel": "3",
     "rollup-plugin-commonjs": "^9.2.0",

yarn.lock

@@ -3208,13 +3208,6 @@ growl@1.9.2:
   resolved "https://registry.yarnpkg.com/growl/-/growl-1.9.2.tgz#0ea7743715db8d8de2c5ede1775e1b45ac85c02f"
   integrity sha1-Dqd0NxXbjY3ixe3hd14bRayFwC8=
 
-gzip-size@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/gzip-size/-/gzip-size-3.0.0.tgz#546188e9bdc337f673772f81660464b389dce520"
-  integrity sha1-VGGI6b3DN/Zzdy+BZgRks4nc5SA=
-  dependencies:
-    duplexer "^0.1.1"
-
 gzip-size@^5.0.0:
   version "5.0.0"
   resolved "https://registry.yarnpkg.com/gzip-size/-/gzip-size-5.0.0.tgz#a55ecd99222f4c48fd8c01c625ce3b349d0a0e80"
@@ -5090,11 +5083,6 @@ preserve@^0.2.0:
   resolved "https://registry.yarnpkg.com/preserve/-/preserve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
   integrity sha1-gV7R9uvGWSb4ZbMQwHE7yzMVzks=
 
-pretty-bytes@^4.0.2:
-  version "4.0.2"
-  resolved "https://registry.yarnpkg.com/pretty-bytes/-/pretty-bytes-4.0.2.tgz#b2bf82e7350d65c6c33aa95aaa5a4f6327f61cd9"
-  integrity sha1-sr+C5zUNZcbDOqlaqlpPYyf2HNk=
-
 pretty-format@^21.0.0:
   version "21.0.0"
   resolved "https://registry.yarnpkg.com/pretty-format/-/pretty-format-21.0.0.tgz#bea1522c4c47e49b44db5b6fbf83e7737251f305"