docs: update internal links to main branch

CONTRIBUTING.md

@@ -4,7 +4,7 @@
 sorts of contributions. They include, but are not limited to:
 
 - Constructive feedback
-- [Questions about usage](https://github.com/electron-userland/electron-installer-debian/blob/master/SUPPORT.md)
+- [Questions about usage](https://github.com/electron-userland/electron-installer-debian/blob/main/SUPPORT.md)
 - [Bug reports / technical issues](#before-opening-bug-reportstechnical-issues)
 - Documentation changes
 - Feature requests
@@ -22,7 +22,7 @@ where appropriate.
 ### Debugging
 
 Troubleshooting suggestions can be found in the [support
-documentation](https://github.com/electron-userland/electron-installer-debian/blob/master/SUPPORT.md#troubleshooting).
+documentation](https://github.com/electron-userland/electron-installer-debian/blob/main/SUPPORT.md#troubleshooting).
 
 ## Contribution suggestions
 
@@ -49,7 +49,7 @@ Here are some things to keep in mind as you file pull requests to fix bugs, add
   Feel free to indicate whether the changes require a major, minor, or patch version bump, as
   prescribed by the [semantic versioning specification](http://semver.org/).
 * Once your pull request is approved, please make sure your commits are rebased onto the latest
-  commit in the master branch, and that you limit/squash the number of commits created to a
+  commit in the main branch, and that you limit/squash the number of commits created to a
   "feature"-level. For instance:
 
 bad:
@@ -94,7 +94,7 @@ Make sure to get an approval from another collaborator before merging a PR.
 - increment the version number appropriately, but not via `npm version` (we'll need to create the
   tag ourselves)
 - push the release branch and create a PR
-- once the PR's merged, `git checkout master && git pull && git tag $VERSION && git push --tags`
+- once the PR's merged, `git checkout main && git pull && git tag $VERSION && git push --tags`
 - create a new GitHub release from the pushed tag with the contents of `NEWS.md` for that version
 - close the milestone associated with the version if one is open
 - `npm publish`

NEWS.md

@@ -2,7 +2,7 @@
 
 ## [Unreleased]
 
-[Unreleased]: https://github.com/electron-userland/electron-installer-debian/compare/v3.1.0...master
+[Unreleased]: https://github.com/electron-userland/electron-installer-debian/compare/v3.1.0...main
 
 ## [3.1.0] - 2020-06-28
 

README.md

@@ -8,10 +8,10 @@
 
 [Usage](#usage) |
 [Options](#options) |
-[Release Notes](https://github.com/electron-userland/electron-installer-debian/blob/master/NEWS.md) |
-[License](https://github.com/electron-userland/electron-installer-debian/blob/master/LICENSE) |
-[Code of Conduct](https://github.com/electron-userland/electron-installer-debian/blob/master/CODE_OF_CONDUCT.md) |
-[Support](https://github.com/electron-userland/electron-installer-debian/blob/master/SUPPORT.md)
+[Release Notes](https://github.com/electron-userland/electron-installer-debian/blob/main/NEWS.md) |
+[License](https://github.com/electron-userland/electron-installer-debian/blob/main/LICENSE) |
+[Code of Conduct](https://github.com/electron-userland/electron-installer-debian/blob/main/CODE_OF_CONDUCT.md) |
+[Support](https://github.com/electron-userland/electron-installer-debian/blob/main/SUPPORT.md)
 
 ## Requirements
 
@@ -360,7 +360,7 @@ Exec=foo %U
 
 #### options.icon
 Type: `String` or `Object[String:String]`
-Default: [`resources/icon.png`](https://github.com/electron-userland/electron-installer-debian/blob/master/resources/icon.png)
+Default: [`resources/icon.png`](https://github.com/electron-userland/electron-installer-debian/blob/main/resources/icon.png)
 
 Path to a single image that will act as icon for the application:
 
@@ -425,7 +425,7 @@ You can read more about [package maintainer scripts](https://www.debian.org/doc/
 
 #### options.desktopTemplate
 Type: `String`
-Default: [`resources/desktop.ejs`](https://github.com/electron-userland/electron-installer-debian/blob/master/resources/desktop.ejs)
+Default: [`resources/desktop.ejs`](https://github.com/electron-userland/electron-installer-debian/blob/main/resources/desktop.ejs)
 
 The absolute path to a custom template for the generated [FreeDesktop.org desktop
 entry](http://standards.freedesktop.org/desktop-entry-spec/desktop-entry-spec-latest.html) file.