Merge pull request #163 from LibraryCarpentry/missing-question-mark

typo - missing question mark

episodes/01-what-is-git.md

@@ -18,7 +18,7 @@ exercises: 0
 
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-## What is Version Control
+## What is Version Control?
 
 Version control is a name used for software which can help you record changes you make to the files in a directory on your computer. Version control software and tools (such as Git and Subversion/SVN) are often associated with software development, and increasingly, they are being used to collaborate in research and academic environments. Version control systems work best with plain text files such as documents or computer code, but modern version control systems can be used to track changes in most types of file.