Reverted WaggleVersion() to WAGGLE_VERSION

Better for there to be a single source of truth for version inside a go
source file.

bugout.go

@@ -46,7 +46,7 @@ func WriteCursorToJournal(client *bugout.BugoutClient, token, journalID, cursorN
 	tags := []string{
 		"type:cursor",
 		fmt.Sprintf("cursor:%s", cursorName),
-		fmt.Sprintf("waggle_version:%s", WaggleVersion()),
+		fmt.Sprintf("waggle_version:%s", WAGGLE_VERSION),
 	}
 	content := fmt.Sprintf("Cursor: %s at %s\nQuery: %s", cursorName, cursor, queryTerms)
 	_, err := client.Spire.CreateEntry(token, journalID, title, content, tags, entryContext)

cmd.go

@@ -101,7 +101,7 @@ func CreateVersionCommand() *cobra.Command {
 		Short: "Print the version number of waggle",
 		Long:  `All software has versions. This is waggle's`,
 		Run: func(cmd *cobra.Command, args []string) {
-			cmd.Println(WaggleVersion())
+			cmd.Println(WAGGLE_VERSION)
 		},
 	}
 	return versionCmd

version.go

@@ -1,16 +1,3 @@
 package main
 
-import (
-	"fmt"
-	"io/ioutil"
-	"os"
-)
-
-func WaggleVersion() string {
-	version, err := ioutil.ReadFile("version.txt")
-	if err != nil {
-		fmt.Println(err.Error())
-		os.Exit(1)
-	}
-	return string(version)
-}
+var WAGGLE_VERSION = "0.0.9"