Merge branch 'master' of https://github.com/bit-docs/bit-docs-tag-diff

Author: tehfedaykin

README.md

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+Adds a @diff tag for use in bit-docs.
+
+@diff takes two file paths and an optional "only" flag. 
+
+The files will be diffed and return the codeblock with the second file's contents with a list of the new lines. 
+To be used in demonstarting changes between files as a tutorial progresses