Brew/snap readme update (#294)

* Add brew info in version, update readme

* Polish download section of readme

* Updated brew instructions in version command

README.md

@@ -10,13 +10,43 @@ Corectl is a command line tool to perform reloads, fetch metadata and evaluate e
 
 ## Download
 
-On **Linux** and **OS X**
+### snap
+
+If you want to install `corectl` using snap you can run:
+
+```bash
+sudo snap install qlik-corectl
+```
+
+This installs `qlik-corectl` with the alias `corectl`, so you can still use it as normal (without the `qlik-` prefix).
+
+### brew
+
+If you want to install `corectl` using brew you have to first tap our homebrew repo with the following:
+
+```bash
+brew tap qlik-oss/taps
+```
+
+after which you can install `corectl` by running:
+
+```
+brew install qlik-corectl
+```
+
+Note that the binary is still installed as `corectl`.
+
+### curl
+
+If you want to install using curl instead, you can use:
+
+For **Linux** or **OS X**
 
 ```bash
  curl --silent --location "https://github.com/qlik-oss/corectl/releases/latest/download/corectl-$(uname -s)-x86_64.tar.gz" | tar xz -C /tmp && mv /tmp/corectl /usr/local/bin/corectl
 ```
 
-On **Windows** with git bash
+For **Windows** with git bash
 
 ```bash
 curl --silent --location "https://github.com/qlik-oss/corectl/releases/latest/download/corectl-windows-x86_64.zip" > corectl.zip && unzip ./corectl.zip -d "$HOME/bin/" && rm ./corectl.zip

cmd/utils.go

@@ -66,18 +66,24 @@ func checkLatestVersion() {
 	}
 	res, err := latest.Check(githubTag, version)
 	if err != nil {
-		internal.FatalError("Could not find latest version:", err)
+		// If we cannot connect to github just print the version
+		fmt.Printf("corectl version: %s\n", version)
+		return
 	}
 	if res.Outdated {
 		// Find absolute path of executable
 		executable, _ := os.Executable()
 		fmt.Println("--------------------------------------------------")
 		fmt.Printf("corectl version: %s, latest version is %s\n", version, res.Current)
 		switch runtime.GOOS {
-			//	case "darwin":
-			//		fmt.Println("To update to the latest version using brew just run:")
-			//		fmt.Print("\n  brew upgrade qlik-corectl\n\n")
-			//		fmt.Println("If you prefer curl, you can run:")
+		case "darwin":
+			fmt.Println("To update to the latest version using brew just run:")
+			fmt.Print("\n  brew upgrade qlik-corectl\n\n")
+			fmt.Println("If you don't already have the qlik-oss tap you have to first add the tap with:")
+			fmt.Print("\n  brew tap qlik-oss/taps\n\n")
+			fmt.Println("And after that, you have to install it with brew by running:")
+			fmt.Print("\n  brew install qlik-corectl\n\n")
+			fmt.Println("If you prefer curl, you can run:")
 		case "linux":
 			fmt.Println("To update to the latest version using snap just run:")
 			fmt.Print("\n  snap refresh qlik-corectl\n\n")