1.0.0. bonniego -version prints version

Everyone needs a version, otherwise how will you know that you need to
upgrade?

README.md

@@ -14,8 +14,7 @@ It presents three disk metrics:
 
 ## Examples
 
-The default settings are typically adequate; the program can be invoked without
-parameters:
+`bonniego` can be invoked without parameters; its defaults are reasonable.
 
 ```
 bonniego
@@ -72,6 +71,18 @@ flag. In this example, we spawn 8 threads:
 bonniego -procs 8
 ```
 
+`-version` will display the current version of `bonniego`:
+
+```
+bonniego -version
+```
+
+Yields:
+
+```
+bonniego version 1.0.0
+```
+
 ## Technical Notes
 
 `bonniego` detects the number of CPU cores and the amount of RAM.

bonniego.go

@@ -17,21 +17,28 @@ import (
 	"time"
 )
 
+const Version = "1.0.0"
 const Blocksize = 0x1 << 16 // 65,536 bytes, 2^16 bytes
 
 func main() {
 	var bonnieTempDir, bonnieParentDir, bonnieDir string
 	var numProcs int
-	var verbose bool
+	var verbose, version bool
 	bonnieTempDir, err := ioutil.TempDir("", "bonniegoParent")
 	check(err)
 	defer os.RemoveAll(bonnieTempDir)
 
 	flag.BoolVar(&verbose, "v", false, "Verbose. Will print to stderr diagnostic information such as the amount of RAM, number of cores, etc.")
+	flag.BoolVar(&version, "version", false, "Version. Will print the current version of bonniego and then exit")
 	flag.IntVar(&numProcs, "procs", runtime.NumCPU(), "The number of concurrent readers/writers, defaults to the number of CPU cores")
 	flag.StringVar(&bonnieParentDir, "dir", bonnieTempDir, "The directory in which bonniego places its temp files, should have at least twice system RAM available")
 	flag.Parse()
 
+	if version {
+		fmt.Printf("bonniego version %s\n", Version)
+		os.Exit(0)
+	}
+
 	// if bonnieParentDir exists, e.g. "/tmp", all is good, but if it doesn't, e.g. "/tmp/bonniego_run_five", then create it
 	fileInfo, err := os.Stat(bonnieParentDir)
 	if err != nil {