Include tests in sdist (pyrogram#819)

Author: dotlambda

MANIFEST.in

@@ -1,10 +1,11 @@
 ## Include
 include README.md COPYING COPYING.lesser NOTICE requirements.txt
 recursive-include compiler *.py *.tl *.tsv *.txt
+recursive-include tests *.py
 
 ## Exclude
 prune pyrogram/errors/exceptions
 prune pyrogram/raw/functions
 prune pyrogram/raw/types
 prune pyrogram/raw/base
-exclude pyrogram/raw/all.py
+exclude pyrogram/raw/all.py