--version and -v handled by version-subcommand

Closes #1

See merge request !7

CHANGELOG.md

 # 0.7.0 / unreleased
 
+* '--version' and '-v' handled by version-subcommand
+
 * pass csv-file to ledger-subcommand:
 
     ```bash

README.md

@@ -13,7 +13,7 @@ Instead, one creates a yaml-config consisting of:
 ## Example
 
 After installation you run `total_recall init bank` to generate the following file:
-```
+```yaml
 # file: bank.yml
 :total_recall:
   :version: 0.6.0

lib/total_recall.rb

@@ -252,9 +252,10 @@ module TotalRecall
       template("simple.yml.tt", destination)
     end
 
-    desc "version", "Show total_recall version"
+    desc "version, --version, -v", "Show total_recall version"
     def version
       puts TotalRecall::VERSION
     end
+    map %w(-v --version) => :version
   end
 end