Move @babel/cli from dependencies to devDependencies

@babel/cli is a build tool not used at runtime by consumers of this
package. Having it in dependencies pulls in glob and minimatch as
transitive deps, which carry high-severity ReDoS vulnerabilities
(GHSA-3ppc-4f35-3m26). Moving it to devDependencies eliminates these
vulnerabilities for all downstream consumers.

Author: ckundo

package.json

@@ -16,10 +16,10 @@
     "fs": false
   },
   "dependencies": {
-    "@babel/cli": "^7.0.0",
     "superagent": "^6.1.0"
   },
   "devDependencies": {
+    "@babel/cli": "^7.0.0",
     "@babel/core": "^7.0.0",
     "@babel/plugin-proposal-class-properties": "^7.0.0",
     "@babel/plugin-proposal-decorators": "^7.0.0",