add dependency

package-lock.json

@@ -1817,6 +1817,11 @@
         "pinkie-promise": "2.0.1"
       }
     },
+    "fit-curve": {
+      "version": "0.1.6",
+      "resolved": "https://registry.npmjs.org/fit-curve/-/fit-curve-0.1.6.tgz",
+      "integrity": "sha1-w72+b1oqO+j4Aerr2kBpGRJWqVs="
+    },
     "for-in": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/for-in/-/for-in-1.0.2.tgz",

package.json

@@ -22,6 +22,7 @@
     "babel-preset-stage-0": "^6.24.1",
     "bezier-js": "^2.2.3",
     "bowser": "^1.8.1",
+    "fit-curve": "^0.1.6",
     "imports-loader": "^0.7.1",
     "memoizee": "^0.3.9",
     "pouchdb": "^6.3.4",