Remove lodash types pin

package.json

@@ -27,7 +27,6 @@
     "@jupyterlab/extension-builder": "^0.10.1",
     "@types/d3-dsv": "^1.0.29",
     "@types/expect.js": "^0.3.29",
-    "@types/lodash": "ts2.0",
     "@types/marked": "0.0.28",
     "@types/mathjax": "0.0.31",
     "@types/mocha": "^2.2.32",