update open source config/docs

Summary:
- master -> main (not yet done, want this change first so tests pass)
- add github actions CI badge
- ignore `.var/` which is used as a cache dir by several projects, including hhast

Reviewed By: bigfootjon

Differential Revision: D32544215

fbshipit-source-id: 6275bd5cec83c2a5a2566541654c6af041d689e7

Author: fredemmott

.gitignore

@@ -5,3 +5,4 @@ tests/examples/*.out
 .DS_Store
 composer.lock
 .*.hhast.*cache
+.var/

CONTRIBUTING.md

@@ -8,13 +8,13 @@ The code of conduct is described in [`CODE_OF_CONDUCT.md`](CODE_OF_CONDUCT.md).
 
 ## Our Development Process
 
-We develop on master, and make releases on an as-needed basic - usually
+We develop on main, and make releases on an as-needed basis - usually
 to support new HHVM releases.
 
 ## Pull Requests
 We actively welcome your pull requests.
 
-1. Fork the repo and create your branch from `master`.
+1. Fork the repo and create your branch from `main`.
 2. If you've added code that should be tested, add tests.
 3. If you've changed APIs, update the documentation.
 4. Ensure the test suite passes.

README.md

@@ -1,5 +1,7 @@
 # DiffLib
 
+[![Continuous Integration](https://github.com/hhvm/difflib/actions/workflows/build-and-test.yml/badge.svg)](https://github.com/hhvm/difflib/actions/workflows/build-and-test.yml)
+
 DiffLib is a Hack library for creating and parsing diffs. Diffs can be created
 between any two sequences of items. Additional helpers (such as support for
 unified diffs, and colored diffs) are provided for string diffs.

composer.json

@@ -4,6 +4,7 @@
     "extra": {
       "branch-alias": {
         "dev-master": "1.x-dev",
+        "dev-main": "1.x-dev",
         "dev-CI_current_pull_request": "1.x-dev"
       }
     },