chore(deps): pin runtime dependency versions (#90)

Greenkeeper doesn't open a PR when the new version satisfies the range
and works. Therefore we receive issues if something breaks and PRs for
breaking changes but not for features or fixes. This will make
Greenkeeper open a PR for every release.

package.json

@@ -42,13 +42,13 @@
     }
   },
   "dependencies": {
-    "@egjs/hammerjs": "^2.0.15",
-    "emitter-component": "^1.1.1",
-    "keycharm": "^0.2.0",
-    "moment": "^2.20.1",
-    "propagating-hammerjs": "^1.4.6",
-    "vis-data": "^6.1.1",
-    "vis-util": "^1.1.4"
+    "@egjs/hammerjs": "2.0.15",
+    "emitter-component": "1.1.1",
+    "keycharm": "0.2.0",
+    "moment": "2.24.0",
+    "propagating-hammerjs": "1.4.7",
+    "vis-data": "6.1.1",
+    "vis-util": "1.1.4"
   },
   "devDependencies": {
     "@babel/core": "^7.5.4",