Adjust package.json

Author: mshima

package-lock.json

@@ -110,10 +110,10 @@
     "nyc": "^15.0.0",
     "prettier": "^2.2.1",
     "proxyquire": "^2.1.3",
-    "sinon": "^12.0.1",
-    "sinon-test": "^3.0.0",
+    "sinon": "^11.1.2",
+    "sinon-test": "^3.1.1",
     "tui-jsdoc-template": "^1.2.2",
-    "xo": "^0.37.1",
+    "xo": "0.37.1",
     "yeoman-assert": "^3.1.1",
     "yeoman-generator": "^5.1.0",
     "yeoman-test": "^6.2.0"
@@ -126,6 +126,7 @@
     ],
     "rules": {
       "import/no-dynamic-require": "off",
+      "import/extensions": "off",
       "prefer-spread": "off",
       "padding-line-between-statements": "off",
       "unicorn/no-hex-escape": "off",