fix: upgrade opencollective-postinstall from 2.0.2 to 2.0.3

Snyk has created this PR to upgrade opencollective-postinstall from 2.0.2 to 2.0.3.

See this package in NPM:
https://www.npmjs.com/package/opencollective-postinstall

See this project in Snyk:
https://app.snyk.io/org/sniperadmin/project/7ee1ec4d-85d7-4a22-9a70-897e94088e48?utm_source=github&utm_medium=upgrade-pr

Author: snyk-bot

package.json

@@ -128,7 +128,7 @@
   },
   "dependencies": {
     "opencollective": "^1.0.3",
-    "opencollective-postinstall": "^2.0.0",
+    "opencollective-postinstall": "^2.0.3",
     "react": "^15.5.4",
     "react-dom": "^15.5.4"
   },

yarn.lock

@@ -6513,10 +6513,10 @@ onetime@^2.0.0:
   dependencies:
     mimic-fn "^1.0.0"
 
-opencollective-postinstall@^2.0.0:
-  version "2.0.2"
-  resolved "https://registry.yarnpkg.com/opencollective-postinstall/-/opencollective-postinstall-2.0.2.tgz#5657f1bede69b6e33a45939b061eb53d3c6c3a89"
-  integrity sha512-pVOEP16TrAO2/fjej1IdOyupJY8KDUM1CvsaScRbw6oddvpQoOfGk4ywha0HKKVAD6RkW4x6Q+tNBwhf3Bgpuw==
+opencollective-postinstall@^2.0.3:
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/opencollective-postinstall/-/opencollective-postinstall-2.0.3.tgz#7a0fff978f6dbfa4d006238fbac98ed4198c3259"
+  integrity sha512-8AV/sCtuzUeTo8gQK5qDZzARrulB3egtLzFgteqB2tcT4Mw7B8Kt7JcDHmltjz6FOAHsvTevk70gZEbhM4ZS9Q==
 
 opencollective@^1.0.3:
   version "1.0.3"