fix(deps): update dependency yargs to v12 (#59)

Author: renovate[bot]

translate/package-lock.json

@@ -6,21 +6,21 @@
   "author": "Google Inc.",
   "repository": "googleapis/nodejs-translate",
   "engines": {
-    "node": ">=4.0.0"
+    "node": ">=6.0.0"
   },
   "scripts": {
     "ava": "ava -T 20s --verbose test/*.test.js ./system-test/*.test.js",
     "cover": "nyc --reporter=lcov --cache ava -T 20s --verbose test/*.test.js ./system-test/*.test.js && nyc report",
     "test": "npm run cover"
   },
   "dependencies": {
-    "@google-cloud/translate": "1.1.0",
-    "yargs": "11.0.0"
+    "@google-cloud/translate": "^1.1.0",
+    "yargs": "^12.0.1"
   },
   "devDependencies": {
-    "@google-cloud/nodejs-repo-tools": "2.3.0",
-    "ava": "0.25.0",
-    "proxyquire": "2.0.1",
-    "sinon": "6.0.1"
+    "@google-cloud/nodejs-repo-tools": "^2.3.0",
+    "ava": "^0.25.0",
+    "proxyquire": "^2.0.1",
+    "sinon": "^6.0.1"
   }
 }