Bump image-size from 0.6.3 to 0.8.3

Bumps [image-size](https://github.com/image-size/image-size) from 0.6.3 to 0.8.3.
- [Release notes](https://github.com/image-size/image-size/releases)
- [Commits](image-size/image-size@v0.6.3...v0.8.3)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

package.json

@@ -78,7 +78,7 @@
     "extract-text-webpack-plugin": "^4.0.0-beta.0",
     "file-loader": "^4.2.0",
     "get-pixels": "^3.3.0",
-    "image-size": "^0.6.1",
+    "image-size": "^0.8.3",
     "imports-loader": "^0.8.0",
     "istanbul": "^0.4.5",
     "jasmine-core": "^2.5.2",