Add homebrew pipeline to .goreleaser.yml

Get onto mac and the popular homebrew.

Create a release with this commit and
push the ain.rb file to the homebrew-tools
repo.

Test plan:
* Run docker run --rm -it --user 1000 homebrew/brew,
  brew tap jonaslu/tools
  brew install ain
  Verify installation works and binary is
  accessible after installation.
* brew uninstall ain, brew untap jonaslu/tools
  cleans up and works.

Author: jonaslu

.goreleaser.yml

@@ -27,6 +27,16 @@ archives:
       - LICENSE*
       - assets/*
     wrap_in_directory: true
+brews:
+  - tap:
+      owner: jonaslu
+      name: homebrew-tools
+    commit_author:
+      name: Jonas Lundberg
+      email: jonasl@iamjonas.me
+    homepage: "https://github.com/jonaslu/ain"
+    description: "Ain is a terminal API client. It's an alternative to postman, paw or insomnia."
+    license: MIT
 release:
   draft: true
 checksum:

README.md

@@ -20,10 +20,22 @@ You need curl or httpie installed and available on your `$PATH`. The easiest way
 Go (version 1.13 or higher) if you want to use `go get` or build it yourself.
 
 # Installation
-If you have go installed on your machine:
-`go get -u github.com/jonaslu/ain/cmd/ain`
 
-If you want to download pre-built binaries:
+## If you have go installed
+Using go get:
+```
+go get -u github.com/jonaslu/ain/cmd/ain
+```
+
+## Via homebrew
+Using the package-manager [homebrew](brew.sh)
+```
+brew tap jonaslu/tools
+brew install ain
+```
+
+## Download binaries yourself
+Install it so it's available on your `$PATH`:
 [https://github.com/jonaslu/ain/releases](https://github.com/jonaslu/ain/releases)
 
 # Quick start