Change master -> main for inclusivity

Author: Aaron Suarez

.circleci/config.yml

@@ -24,7 +24,7 @@ workflows:
           filters:
             branches:
               only:
-                - master
+                - main
 
 jobs:
   build_test:

CONTRIBUTING.md

@@ -121,11 +121,11 @@ technology/tool. It's a very nice way to ramp up quickly with specific tooling.
 - Once you have finished working on your issue, push your changes to your own
   github repo, and then submit a pull request.
 
-- To return to your main `master` branch, type the following command in your
+- To return to your `main` branch, type the following command in your
   terminal.
 
   ```bash
-  git checkout master
+  git checkout main
   ```
 
   </details>

README.md

@@ -130,7 +130,7 @@ This project began when I ([Aaron Suarez](https://github.com/aaron-suarez)) star
 
 Immediately, I received several requests from others asking for this list. I started to share it around via DMs, and someone suggested that I put it up on GitHub. I also got a lot of feedback about how it would be nice if there was more metadata, like a way to categorize the resources, organize them by language, and maybe even have some notes or a description (assuming the title isn't obvious). Meanwhile, the list continued to grow rapidly.
 
-Someone got the bright idea to put it on the OC website, so I started working on a PR to incorporate it into OC, which at the time used Rails and YAML files to serve up list-like content. However, a redesign of the site was in progress, so my PR was never merged. Eventually I got out of the military and began doing software development full time. I kept maintaining the list as a little side project and sharing it around, but it hasn't made it onto the OC website. However, the [resources.yml](https://github.com/OperationCode/resources_api/blob/master/resources.yml) file is accessible via Slack with a slash command, so if you type `/repeat resources` in a public channel, the bot will link you to that file.
+Someone got the bright idea to put it on the OC website, so I started working on a PR to incorporate it into OC, which at the time used Rails and YAML files to serve up list-like content. However, a redesign of the site was in progress, so my PR was never merged. Eventually I got out of the military and began doing software development full time. I kept maintaining the list as a little side project and sharing it around, but it hasn't made it onto the OC website. However, the [resources.yml](https://github.com/OperationCode/resources_api/blob/main/resources.yml) file is accessible via Slack with a slash command, so if you type `/repeat resources` in a public channel, the bot will link you to that file.
 
 Eventually, the idea to use the data for multiple purposes was proposed. One really cool idea was for a Slack bot to ping relevant channels with random resources on a regular basis so that people could find awesome resources that had been shared without having to find them by searching the slack history. So it was decided that a full featured API would be important in order to really serve the needs of the OC community. This repo contains the source for the aforementioned API.
 

app.ini

@@ -15,6 +15,9 @@ module = run
 ; This is the name of the variable
 ; in our script that will be called
 callable = app_dispatch
+
+; this problematic verbiage is necessary for uWSGI...
+; perhaps one day they'll have a more inclusive name for this setting
 master = true
 ; Set uWSGI to start up 2 workers
 processes = 2