Merge pull request #96 from triggermesh/docs-tm

update install instructions for tm

Author: Sameer Naik

docs/tm/install.md

@@ -1,24 +1,25 @@
-## Installation
+# Installation
 
-There are three ways to get `tm`:
+The `tm` binary can be installed from pre-built binary releases or can be built directly from source.
 
-### With Go
+### From binary releases
 
-With a working [Golang](https://golang.org/doc/install) environment do:
+Releases are available for 64-bit versions of Linux, macOS and Windows platforms.
 
-```
-go get github.com/triggermesh/tm
-```
+1. Download the desired version from the [releases](https://github.com/triggermesh/tm/releases) page.
+2. Move it to its desired destination (`mv tm-linux-amd64 /usr/local/bin/tm`)
+3. Make it executable `chmod +x /usr/local/bin/tm`
 
-### A Release
-Head to the GitHub [release page](https://github.com/triggermesh/tm/releases) and download a release.
+### From Homebrew (macOS and Linux)
 
-### Brew on OSX
-On OSX use the TriggerMesh tap
-
-```
-brew tap triggermesh/tap
+```bash
 brew install tm
-which tm
 ```
 
+### From source (Linux / macOS)
+
+To build the `tm` binary from source you need the [Go](https://golang.org/doc/install) compiler toolchain.
+
+```bash
+go get github.com/triggermesh/tm
+```