fix: reinclude babel-runtime as dependency

Author: Federico Zivolo

.size-snapshot.json

@@ -1,25 +1,25 @@
 {
   "dist/index.umd.js": {
-    "bundled": 49222,
-    "minified": 17476,
-    "gzipped": 5540
+    "bundled": 49514,
+    "minified": 17648,
+    "gzipped": 5674
   },
   "dist/index.umd.min.js": {
-    "bundled": 23917,
-    "minified": 9697,
-    "gzipped": 3231
+    "bundled": 25173,
+    "minified": 10015,
+    "gzipped": 3378
   },
   "dist/index.esm.js": {
     "bundled": 9538,
     "minified": 5425,
     "gzipped": 1716,
     "treeshaked": {
       "rollup": {
-        "code": 4469,
+        "code": 4471,
         "import_statements": 137
       },
       "webpack": {
-        "code": 5590
+        "code": 5205
       }
     }
   }

package.json

@@ -58,6 +58,7 @@
     "react": "0.14.x || ^15.0.0 || ^16.0.0"
   },
   "dependencies": {
+    "babel-runtime": "6.x.x",
     "create-react-context": "^0.2.1",
     "popper.js": "^1.14.1",
     "prop-types": "^15.6.1",