Make TARS great again! (#130)

* Make TARS great again!

- drop Node legacy versions
- update `gulp-sass` and `posix` packages for prevent `node-gyp` errors
- remove `yarn.lock` file. Multiply package managers for single project, oh my...

* fix version

* add missed `sass` package

Author: evilsprut

.travis.yml

@@ -6,10 +6,7 @@ os:
 
 env:
     matrix:
-        - export NODE_VERSION="13"
-        - export NODE_VERSION="12"
-        - export NODE_VERSION="11"
-        - export NODE_VERSION="10"
+        - export NODE_VERSION="16"
 
 matrix:
     fast_finish: true

appveyor.yml

@@ -17,10 +17,7 @@
   # What combinations to test
   environment:
       matrix:
-          - nodejs_version: 13
-          - nodejs_version: 12
-          - nodejs_version: 11
-          - nodejs_version: 10
+          - nodejs_version: 16
 
   install:
       - ps: Install-Product node $env:nodejs_version $env:platform