Upgrade schema utils (#11)

* schema-utils 2.x drop support for Node.js < 8.9.0

* bump schema-utils@2.2.0

Author: justjavac

package.json

@@ -9,7 +9,7 @@
   "bugs": "https://github.com/justjavac/json-perf-loader/issues",
   "main": "src/index.js",
   "engines": {
-    "node": ">= 8.0.0"
+    "node": "> 8.9.0"
   },
   "scripts": {
     "clean": "rimraf -rf coverage",
@@ -37,7 +37,7 @@
   },
   "dependencies": {
     "loader-utils": "^1.1.0",
-    "schema-utils": "^1.0.0"
+    "schema-utils": "^2.2.0"
   },
   "devDependencies": {
     "codecov": "^3.5.0",

yarn.lock

@@ -4626,6 +4626,14 @@ schema-utils@^1.0.0:
     ajv-errors "^1.0.0"
     ajv-keywords "^3.1.0"
 
+schema-utils@^2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/schema-utils/-/schema-utils-2.2.0.tgz#48a065ce219e0cacf4631473159037b2c1ae82da"
+  integrity sha512-5EwsCNhfFTZvUreQhx/4vVQpJ/lnCAkgoIHLhSpp4ZirE+4hzFvdJi0FMub6hxbFVBJYSpeVVmon+2e7uEGRrA==
+  dependencies:
+    ajv "^6.10.2"
+    ajv-keywords "^3.4.1"
+
 semver-compare@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/semver-compare/-/semver-compare-1.0.0.tgz#0dee216a1c941ab37e9efb1788f6afc5ff5537fc"