explictly depend on semver-compare

Somehow this fails only on heroku

Author: sivakumar-kailasam

package.json

@@ -52,6 +52,7 @@
 		"rev-file": "^3.0.0",
 		"rimraf": "^2.6.3",
 		"rsvp": "^4.8.5",
+		"semver-compare": "^1.0.0",
 		"semver-extra": "^3.0.0",
 		"semver-utils": "^1.1.4",
 		"yuidoc-to-jsonapi": "^0.4.1"

yarn.lock

@@ -2535,6 +2535,7 @@ seek-bzip@^1.0.5:
 semver-compare@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/semver-compare/-/semver-compare-1.0.0.tgz#0dee216a1c941ab37e9efb1788f6afc5ff5537fc"
+  integrity sha1-De4hahyUGrN+nvsXiPavxf9VN/w=
 
 semver-extra@^3.0.0:
   version "3.0.0"