Neutral naming for package-spec (#258)

.github/ISSUE_TEMPLATE/Change_Proposal.md

@@ -5,4 +5,4 @@ labels: discuss
 title: "[Change Proposal] "
 ---
 
-Please read the section on [Change Proposals in the Contributing Guide](https://github.com/elastic/package-spec/blob/master/CONTRIBUTING.md#change-proposals) and flesh out this issue accordingly. Thank you!
+Please read the section on [Change Proposals in the Contributing Guide](https://github.com/elastic/package-spec/blob/main/CONTRIBUTING.md#change-proposals) and flesh out this issue accordingly. Thank you!

.github/PULL_REQUEST_TEMPLATE.md

@@ -18,8 +18,8 @@ Add a checklist of things that are required to be reviewed in order to have the
 List here all the items you have verified BEFORE sending this PR. Please DO NOT remove any item, striking through those that do not apply. (Just in case, strikethrough uses two tildes. ~~Scratch this.~~)
 -->
 
-- [ ] I have added test packages to [`test/packages`](https://github.com/elastic/package-spec/tree/master/test/packages) that prove my change is effective.
-- [ ] I have added an entry in [`versions/N/changelog.yml`](https://github.com/elastic/package-spec/blob/master/versions/1/changelog.yml).
+- [ ] I have added test packages to [`test/packages`](https://github.com/elastic/package-spec/tree/main/test/packages) that prove my change is effective.
+- [ ] I have added an entry in [`versions/N/changelog.yml`](https://github.com/elastic/package-spec/blob/main/versions/1/changelog.yml).
 
 ## Related issues
 

.mergify.yml

@@ -9,7 +9,7 @@ pull_request_rules:
     conditions:
       - check-success=package-spec/pr-merge
       - check-success=CLA
-      - base=master
+      - base=main
       - author~=^dependabot(|-preview)\[bot\]$
     actions:
       queue: