add goreleaser

Add a goreleaser configuration file that builds binaries for Linux,
MacOS and Windows, for 32bit (x86/386) and 64bit (x64/amd64). The
binaries will be archived into a tar.gz/zip file along with the LICENSE
file.

The `dist/` directory will be written to by goreleaser with the binaries
during the build process, so it's also been added to .gitignore.

Goreleaser can be installed with:
go get github.com/goreleaser/goreleaser

Or other methods for install can be found at:
https://goreleaser.com

To build all the binaries and release them to GitHub:
1. Tag the release. e.g. `git tag -a v1.0.0 -m 'First release'`
2. Generate a GitHub Personal Access Token. See https://github.com/settings/tokens.
3. Push the release to GitHub. e.g. `git push origin v1.0.0`
4. Run goreleaser. e.g.  `GITHUB_TOKEN=xxxxxxx... goreleaser`

Go releaser will build the binaries, and upload the binaries to the
GitHub project's release page for the release that was tagged.

.gitignore

@@ -0,0 +1 @@
+dist/

cmd/grpcurl/.goreleaser.yml

@@ -0,0 +1,22 @@
+builds:
+  - binary: grpcurl
+    goos:
+      - linux
+      - darwin
+      - windows
+    goarch:
+      - amd64
+      - 386
+
+archive:
+  wrap_in_directory: true
+  format: tar.gz
+  format_overrides:
+    - goos: windows
+      format: zip
+  replacements:
+    amd64: x64
+    386: x86
+    darwin: macos
+  files:
+    - LICENSE

cmd/grpcurl/grpcurl.go

@@ -30,6 +30,8 @@ import (
 	"github.com/fullstorydev/grpcurl"
 )
 
+var version = "<not set>"
+
 var (
 	exit = os.Exit
 
@@ -37,6 +39,8 @@ var (
 
 	help = flag.Bool("help", false,
 		`Print usage instructions and exit.`)
+	printVersion = flag.Bool("version", false,
+		`Print version.`)
 	plaintext = flag.Bool("plaintext", false,
 		`Use plain-text HTTP/2 when connecting to server (no TLS).`)
 	insecure = flag.Bool("insecure", false,
@@ -146,6 +150,10 @@ func main() {
 		usage()
 		os.Exit(0)
 	}
+	if *printVersion {
+		fmt.Fprintf(os.Stderr, "%s v%s\n", os.Args[0], version)
+		os.Exit(0)
+	}
 
 	// Do extra validation on arguments and figure out what user asked us to do.
 	if *plaintext && *insecure {