fix(deps): move rollup-plugin-ts to dev deps (#124)

Author: Benjamin E. Coe

package.json

@@ -49,7 +49,6 @@
   "author": "Ben Coe <ben@npmjs.com>",
   "license": "ISC",
   "dependencies": {
-    "rollup-plugin-ts": "^3.0.2",
     "string-width": "^4.2.0",
     "strip-ansi": "^6.0.1",
     "wrap-ansi": "^7.0.0"
@@ -69,6 +68,7 @@
     "mocha": "^9.1.3",
     "rimraf": "^3.0.2",
     "rollup": "^2.23.1",
+    "rollup-plugin-ts": "^3.0.2",
     "standardx": "^7.0.0",
     "typescript": "^4.0.0"
   },