Specify version range for @types/fs-capacitor (#3)

The types have been removed from DefinitelyTyped in
DefinitelyTyped/DefinitelyTyped#62785

Version 8.0.0 is the stub package, and version 2.0.0 is the only other
version that exists, so pinning this version should not mess up any
dependency tree and just fix the type problem.

package.json

@@ -35,7 +35,7 @@
   },
   "dependencies": {
     "@types/express": "*",
-    "@types/fs-capacitor": "*",
+    "@types/fs-capacitor": "^2.0.0",
     "@types/koa": "*",
     "busboy": "^0.3.1",
     "fs-capacitor": "^2.0.4",