Removed single quotes in nyc exclude

Author: Sean Newell

package.json

@@ -10,8 +10,8 @@
     "prepare-test-v4": "npm install [email protected] && npm run build-tests-es6",
     "test-v3": "npm run prepare-test-v3 && npm run exec-tests",
     "test-v4": "npm run prepare-test-v4 && npm run exec-tests",
-    "cover-v3": "npm run prepare-test-v3 && nyc --exclude 'lib/models/v4/**/*.js' --all --require source-map-support/register mocha test/specs/",
-    "cover-v4": "npm run prepare-test-v4 && nyc --exclude 'lib/models/v3/**/*.js' --all --require source-map-support/register mocha test/specs/",
+    "cover-v3": "npm run prepare-test-v3 && nyc --exclude lib/models/v4/**/*.js --all --require source-map-support/register mocha test/specs/",
+    "cover-v4": "npm run prepare-test-v4 && nyc --exclude lib/models/v3/**/*.js --all --require source-map-support/register mocha test/specs/",
     "exec-tests": "mocha test/specs/",
     "test": "npm run test-v4 && npm run test-v3",
     "cover": "npm run cover-v4 && npm run cover-v3",