#16 Add git repository check

katip was generating multiple lines of error, while running under
a directory which is not a git initiliazed directory. Control added
to check if directory is initialized as a git repostiory

CHANGELOG.md

@@ -1,5 +1,6 @@
 
 #### [Current]
+ * [8b22c6f](../../commit/8b22c6f) Add latest change log __(Murat Kemal BAYGÜN)__
  * [5fc6991](../../commit/5fc6991) #14 Update readme, add sample output __(Murat Kemal BAYGÜN)__
  * [3f7788c](../../commit/3f7788c) #14 update README.md __(Onur Ozgur OZKAN)__
 

bin/katip

@@ -2,6 +2,16 @@
 
 REPO_URL='../../commit/'
 
+def git_repository?
+  initialized = `git rev-parse --is-inside-work-tree`.chomp
+
+  if initialized != 'true'
+    initialized = false
+    puts 'Exiting. Nothing to create log file.'
+  end
+  initialized
+end
+
 def write_file(output)
 
   file_name='CHANGELOG.md'
@@ -53,6 +63,7 @@ def parse_change_log
   output
 end
 
-write_file parse_change_log
-
+if git_repository?
+  write_file parse_change_log
+end