fix(security): updated compression lib in package.json to reduce vuln…

…erabilities (meanjs#1812)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/npm:ms:20170412

Latest report for meanjs/mean:
https://snyk.io/test/github/meanjs/mean

package.json

@@ -39,7 +39,7 @@
     "body-parser": "~1.17.1",
     "bower": "~1.8.0",
     "chalk": "~1.1.3",
-    "compression": "~1.6.2",
+    "compression": "~1.7.0",
     "connect-flash": "~0.1.1",
     "connect-mongo": "~1.3.2",
     "cookie-parser": "~1.4.1",