chore: update all dependencies and switch to yarn

Author: luggage66

.travis.yml

@@ -8,12 +8,12 @@ stages:
 
 language: node_js
 node_js:
-- '6'
-- '8'
 - '10'
+- '12'
+- '14'
 after_success:
-  - npm run coverage
-  - npm run build:docs
+  - yarn run coverage
+  - yarn run build:docs
 
 notifications:
   webhooks:

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+    "npm.packageManager": "yarn"
+}

README.md

@@ -48,15 +48,15 @@ More examples are available in [src/examples/](https://github.com/luggage66/Spra
 ## Building / Running examples
 
 ```sh
-npm install
-npm run build
-npm run test
+yarn install
+yarn run build
+yarn run test
 ```
 
 To run as example
 
 ```sh
-npm run build && node dist/examples/sql
+yarn run build && node dist/examples/sql
 ```
 
 Is VSCode, just run task "npm: install", then F5 to run.