no-save flag added to 'npm install sequelize' command in test preparation

Author: RobinBuschmann

package.json

@@ -6,8 +6,8 @@
     "build": "tsc --project lib/models/v4 && tsc",
     "build-tests-es5": "tsc --project test",
     "build-tests-es6": "tsc --project test --target es6 && tsc",
-    "prepare-test-v3": "npm install [email protected] && npm run build-tests-es5",
-    "prepare-test-v4": "npm install [email protected] && npm run build-tests-es6",
+    "prepare-test-v3": "npm install [email protected] --no-save && npm run build-tests-es5",
+    "prepare-test-v4": "npm install [email protected] --no-save && 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/",