chore: migrate from master to main branch

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: lorey

.github/workflows/ci.yml

@@ -2,9 +2,9 @@ name: CI
 
 on:
   push:
-    branches: [master, main]
+    branches: [main]
   pull_request:
-    branches: [master, main]
+    branches: [main]
 
 jobs:
   lint:

CLAUDE.md

@@ -0,0 +1,58 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+Socials is a Python library for detecting and extracting social media profile URLs from a list of hrefs. It uses regex pattern matching to identify URLs from Facebook, Twitter, LinkedIn, GitHub, Instagram, YouTube, and email addresses.
+
+## Development Commands
+
+```bash
+# Setup
+virtualenv -p /usr/bin/python3 venv
+source venv/bin/activate
+pip install -r requirements-dev.txt
+
+# Testing
+tox                      # Multi-Python version testing
+python setup.py test     # Single test run
+make test                # Alternative: runs py.test
+
+# Linting
+make lint                # Runs flake8 socials tests
+
+# Coverage
+make coverage            # Generates HTML coverage report
+
+# Release (requires bumpversion)
+bumpversion patch && git push --tags
+```
+
+## Architecture
+
+The library is a single-module design in `socials/socials.py`:
+
+- **Platform constants**: `PLATFORM_FACEBOOK`, `PLATFORM_GITHUB`, etc.
+- **Regex patterns**: Each platform has a list of regex patterns (e.g., `FACEBOOK_URL_REGEXS`)
+- **PATTERNS dict**: Maps platform constants to their regex lists
+- **Extraction class**: Wrapper returned by `socials.extract()` with methods:
+  - `get_matches_per_platform()` - returns dict of all matches by platform
+  - `get_matches_for_platform(platform)` - returns list for specific platform
+- **Cleaners**: Optional post-processing functions (e.g., `clean_mailto` strips `mailto:` prefix)
+
+## Adding a New Platform
+
+1. Add platform constant: `PLATFORM_X = 'x'`
+2. Add regex list: `X_URL_REGEXS = [r'^http(s)?://...']`
+3. Add to `PATTERNS` dict
+4. Add test cases in `tests/test_socials.py`
+5. If needed, add cleaner function and register in `get_cleaner()`
+
+## Regex Conventions
+
+- All patterns use `^` and `$` anchors for exact matching
+- Character classes use `[A-Za-z0-9_-]` (avoiding chars between Z and a in ASCII)
+- Optional trailing slash: `/?$`
+- Optional https: `http(s)?://`
+- Optional www: `(www\.)?`

docs/changelog.md

@@ -1,3 +1,3 @@
 # Changelog
 
-See [CHANGELOG.md on GitHub](https://github.com/lorey/socials/blob/master/CHANGELOG.md) for the full changelog.
+See [CHANGELOG.md on GitHub](https://github.com/lorey/socials/blob/main/CHANGELOG.md) for the full changelog.