Improve keywords

Author: ignlg

package.json

@@ -3,14 +3,18 @@
   "description": "Powerful TypeScript/JavaScript library to simplify paths or surfaces between 2 and N dimensions efficiently.",
   "keywords": [
     "simplify",
+    "simplification",
+    "optimization",
     "path",
     "surface",
     "geometry",
     "geojson",
     "topology",
     "topojson",
-    "data structure",
     "algorithm",
+    "route",
+    "line",
+    "curve",
     "typescript"
   ],
   "main": "dist/simplify-path-js.umd.js",