ci: test with pnpm

Author: zkochan

.travis.yml

@@ -1,9 +1,12 @@
 language: node_js
 sudo: false
 node_js:
+  - "12"
   - "10"
-  - "9"
   - "8"
-  - "7"
-  - "6"
-  - "4"
+before_install:
+  - curl -L https://unpkg.com/@pnpm/self-installer | node
+install:
+  - pnpm install
+script:
+  - pnpm test

appveyor.yml

@@ -1,23 +1,19 @@
 environment:
   matrix:
+    - nodejs_version: "12"
     - nodejs_version: "10"
-    - nodejs_version: "9"
     - nodejs_version: "8"
-    - nodejs_version: "7"
-    - nodejs_version: "6"
-    - nodejs_version: "4"
 
 platform:
   - x64
 
 install:
   - ps: Install-Product node $env:nodejs_version $env:platform
-  - npm config set spin false
-  - npm i -g npm@latest
-  - npm install
+  - curl -L https://unpkg.com/@pnpm/self-installer | node
+  - pnpm install
 
 test_script:
-  - npm test
+  - pnpm test
 
 matrix:
   fast_finish: true