Update MANIFEST.in file.

Signed-off-by: Tim 'mithro' Ansell <me@mith.ro>

MANIFEST.in

diff --git a/MANIFEST.in b/MANIFEST.in
index 0d2d920..b9318a3 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,3 +1,7 @@
+exclude .readthedocs.yml
+exclude tox.ini
+exclude *.swp
+
 # Include the README
 include *.md
 
@@ -6,4 +10,18 @@
 
 include *.yapf
 include *.txt
+
 recursive-include v2x *.py
+
+
+# Docs
+recursive-include docs *.py
+recursive-include docs *.rst
+recursive-include docs *.txt
+recursive-include docs *.yml
+recursive-include docs Makefile
+prune docs/_*
+prune docs/env
+
+# Tests
+graft tests