docs: update

.github/workflows/main.yml

@@ -1,4 +1,4 @@
-name: CI
+name: Shellcheck
 
 on: [push]
 

.travis.yml

@@ -1,10 +0,0 @@
-language: bash
-
-install:
-  # Install a custom version of shellcheck instead of Travis CI's default
-  - scversion=latest
-  - wget "https://storage.googleapis.com/shellcheck/shellcheck-${scversion}.linux.x86_64.tar.xz"
-  - tar --xz -xvf "shellcheck-${scversion}.linux.x86_64.tar.xz"
-  - shellcheck() { "shellcheck-${scversion}/shellcheck" "$@"; }
-
-script: shellcheck -e 2034 */*/build */*/post-install