refactor: use yarn consistently

Author: jasonkuhrt

.github/RELEASE.md

@@ -2,7 +2,7 @@
 
 ## 1. Create Release Notes
 1. [Draft a new release on Github](https://github.com/prisma/graphqlgen/releases/new)
-2. `npm install -g git-release-notes`
+2. `yarn global add git-release-notes`
 3. Get the release notes from executing `.github/make-release-notes.sh`
 4. Separate them like [here](https://github.com/prisma/graphqlgen/releases/tag/0.5.0) by Features and Fixes and add them to the draft
 5. Get feedback for the draft

docs/package.json

@@ -1,8 +1,8 @@
 {
   "scripts": {
     "prepare": "gitbook install && cp -a node_modules/highlight.js/. ~/.gitbook/versions/3.2.3/node_modules/highlight.js/",
-    "build": "npm run prepare && gitbook build && mv _book tmp && mkdir _book && mv tmp _book/graphqlgen",
-    "start": "npm run prepare && gitbook serve"
+    "build": "yarn prepare && gitbook build && mv _book tmp && mkdir _book && mv tmp _book/graphqlgen",
+    "start": "yarn prepare && gitbook serve"
   },
   "devDependencies": {
     "gitbook-cli": "2.3.2"

packages/create-graphqlgen/package.json

@@ -3,7 +3,7 @@
   "version": "0.6.0-rc3",
   "main": "dist/index.js",
   "scripts": {
-    "prepare": "npm run build",
+    "prepare": "yarn build",
     "clean": "rimraf dist",
     "build": "yarn clean && tsc --declaration",
     "build:watch": "yarn clean && tsc --declaration --watch",

packages/graphqlgen-json-schema/package.json

@@ -7,9 +7,9 @@
     "dist"
   ],
   "scripts": {
-    "prepare": "npm run build",
+    "prepare": "yarn build",
     "build": "rm -rf dist && tsc -d; cp src/schema.json dist",
-    "test": "npm run build",
+    "test": "yarn build",
     "t": "jest"
   },
   "devDependencies": {

packages/graphqlgen/package.json

@@ -14,15 +14,15 @@
   },
   "scripts": {
     "clean": "rm -rf ./src/tests/**/tmp && rm -rf ./src/tests/**/generated",
-    "prepublish": "rm -rf example/node_modules && npm test && npm run build",
+    "prepublish": "rm -rf example/node_modules && yarn test && yarn build",
     "benchmarks": "ts-node benchmarks",
-    "build": "npm run clean && npm run lint && tsc --declaration",
+    "build": "yarn clean && yarn lint && tsc --declaration",
     "watch": "tsc -w",
     "lint": "tslint --project tsconfig.json {src,test}/**/*.ts",
     "test": "jest",
     "check:types": "yarn tsc --noEmit",
     "test:watch": "jest --watch",
-    "test:ci": "npm run lint && jest --maxWorkers 4",
+    "test:ci": "yarn lint && jest --maxWorkers 4",
     "gen": "ts-node --files src/index.ts"
   },
   "repository": {