Remove vendor related things

Author: gousaiyang

.gitmodules

@@ -1,12 +1,3 @@
 [submodule "codec"]
 	path = codec
 	url = https://github.com/JarryShaw/f2format-codec.git
-[submodule "vendor/cpython"]
-	path = vendor/cpython
-	url = https://github.com/python/cpython.git
-[submodule "vendor/typed_ast"]
-	path = vendor/typed_ast
-	url = https://github.com/python/typed_ast.git
-[submodule "vendor/parso"]
-	path = vendor/parso
-	url = https://github.com/davidhalter/parso.git

Makefile

@@ -122,13 +122,6 @@ git-upload:
 	git commit -a -S
 	git push
 
-# update submodules
-git-submodule:
-	(cd vendor/cpython && git pull)
-	(cd vendor/parso && git pull)
-	(cd vendor/pypy && hg pull && hg update)
-	(cd vendor/typed_ast && git pull)
-
 # upload after distro
 git-aftermath: git-submodule
 	git pull