fix: pin @types/sinon to 5.0.5

Author: greenkeeper[bot]

package.json

@@ -22,7 +22,7 @@
     "@types/lodash": "^4.14.118",
     "@types/react-dom": "^16.0.9",
     "@types/react-test-renderer": "^16.0.3",
-    "@types/sinon": "^5.0.5",
+    "@types/sinon": "5.0.5",
     "@types/sinon-chai": "^3.2.0",
     "@types/webpack": "^4.4.19",
     "coveralls": "^3.0.2",