Default branch rename

Helps with whatwg/meta#174.

.github/workflows/dispatch.yml

@@ -4,7 +4,7 @@ name: Dispatch
 on:
   push:
     branches:
-    - master
+    - main
 jobs:
   dispatch:
     name: Dispatch

.github/workflows/test.yml

@@ -2,10 +2,10 @@ name: Test
 on:
   pull_request:
     branches:
-    - master
+    - main
   push:
     branches:
-    - master
+    - main
 jobs:
   test:
     name: Test

README.md

@@ -49,8 +49,8 @@ The Steering Group has adopted the following additional policies:
 
 (These are maintained as Markdown resources in this repository, except for the Contributor and
 Workstream Participant Agreement which is maintained as
-[agreement.hbs](https://github.com/whatwg/participate.whatwg.org/commits/master/agreement.hbs) in
-the [participate.whatwg.org](https://github.com/whatwg/participate.whatwg.org) repository.)
+[agreement.hbs](https://github.com/whatwg/participate.whatwg.org/commits/main/agreement.hbs) in the
+[participate.whatwg.org](https://github.com/whatwg/participate.whatwg.org) repository.)
 
 
 ## Steering Group representatives

policy-link-mapping.txt

@@ -7,6 +7,6 @@
 ./Privacy%20Policy.md=privacy-policy
 ./Policies.md=policies
 ./Working%20Mode.md=working-mode
-./db.json=https://github.com/whatwg/sg/blob/master/db.json
-./ThirdPartyNotices/W3CLicenses.md=https://github.com/whatwg/sg/blob/master/ThirdPartyNotices/W3CLicenses.md
-./LICENSE=https://github.com/whatwg/sg/blob/master/LICENSE
+./db.json=https://github.com/whatwg/sg/blob/main/db.json
+./ThirdPartyNotices/W3CLicenses.md=https://github.com/whatwg/sg/blob/main/ThirdPartyNotices/W3CLicenses.md
+./LICENSE=https://github.com/whatwg/sg/blob/main/LICENSE