chores(CI): use yarn (#9904)

.travis.yml

-sudo: false
+sudo: true
 dist: trusty
 
 language: node_js
@@ -10,24 +10,18 @@ branches:
   except:
     - /^v\d+\.\d+\.\d+$/
 
-cache:
-  directories:
-    - $HOME/.npm
+cache: yarn
+
+install:
+  - npm install -g yarn
+  - yarn
 
 env:
   global:
-    # mysql info
-    - SEQ_MYSQL_DB=sequelize_test
-    - SEQ_MYSQL_USER=sequelize_test
-    - SEQ_MYSQL_PW=sequelize_test
-    - SEQ_MYSQL_HOST=127.0.0.1
-    - SEQ_MYSQL_PORT=8980
-    # postgres info
-    - SEQ_PG_DB=sequelize_test
-    - SEQ_PG_USER=sequelize_test
-    - SEQ_PG_PW=sequelize_test
-    - SEQ_PG_HOST=127.0.0.1
-    - SEQ_PG_PORT=8990
+    - SEQ_DB=sequelize_test
+    - SEQ_USER=sequelize_test
+    - SEQ_PW=sequelize_test
+    - SEQ_HOST=127.0.0.1
 
 before_script:
   # mount ramdisk
@@ -53,7 +47,7 @@ jobs:
     - stage: test
       node_js: '6'
       sudo: required
-      env: MYSQL_VER=mysql-57 DIALECT=mysql COVERAGE=true
+      env: MYSQL_VER=mysql-57 SEQ_MYSQL_PORT=8980 DIALECT=mysql COVERAGE=true
     - stage: test
       node_js: '6'
       sudo: required
@@ -61,11 +55,11 @@ jobs:
     - stage: test
       node_js: '6'
       sudo: required
-      env: POSTGRES_VER=postgres-95 DIALECT=postgres COVERAGE=true
+      env: POSTGRES_VER=postgres-95 SEQ_PG_PORT=8990 DIALECT=postgres COVERAGE=true
     - stage: test
       node_js: '6'
       sudo: required
-      env: POSTGRES_VER=postgres-95 DIALECT=postgres-native COVERAGE=true
+      env: POSTGRES_VER=postgres-95 SEQ_PG_PORT=8990 DIALECT=postgres-native COVERAGE=true
     - stage: test
       node_js: '8'
       env: DIALECT=sqlite

codecov.yml

-comment:
-  layout: "header, changes"
-  behavior: default
-

package.json

@@ -36,8 +36,6 @@
     "wkx": "^0.4.5"
   },
   "devDependencies": {
-    "@semantic-release/github": "^5.0.0",
-    "@semantic-release/npm": "^5.0.2",
     "chai": "^4.x",
     "chai-as-promised": "^7.x",
     "chai-datetime": "^1.x",
@@ -65,7 +63,6 @@
     "pg-native": "^3.0.0",
     "pg-types": "^1.x",
     "rimraf": "^2.x",
-    "semantic-release": "^15.8.0",
     "sinon": "^6.0.0",
     "sinon-chai": "^3.2.0",
     "sqlite3": "^4.0.2",
@@ -126,8 +123,7 @@
     "sscce-mysql": "cross-env DIALECT=mysql npm run sscce",
     "sscce-postgres": "cross-env DIALECT=postgres npm run sscce",
     "sscce-sqlite": "cross-env DIALECT=sqlite npm run sscce",
-    "commitmsg": "validate-commit-msg",
-    "semantic-release": "semantic-release"
+    "commitmsg": "validate-commit-msg"
   },
   "engines": {
     "node": ">=6.0.0"
@@ -137,15 +133,5 @@
     "commitizen": {
       "path": "./node_modules/cz-conventional-changelog"
     }
-  },
-  "release": {
-    "branch": "master",
-    "verifyConditions": [
-      "@semantic-release/npm",
-      "@semantic-release/github"
-    ]
-  },
-  "publishConfig": {
-    "tag": "next"
   }
 }