Fix errors in manifest file

I am getting the following error when installing with Pip from PyPI or from source (with -e git+https://...)


	reading manifest file 'django_silk.egg-info\SOURCES.txt'
	reading manifest template 'MANIFEST.in'
	Traceback (most recent call last):
	  File "<string>", line 17, in <module>
	  File "D:\Dev\AssetTools\git\env\src\silk\setup.py", line 43, in <module>
		'pytz'
	  File "C:\Python27\Lib\distutils\core.py", line 152, in setup
		dist.run_commands()
	  File "C:\Python27\Lib\distutils\dist.py", line 953, in run_commands
		self.run_command(cmd)
	  File "C:\Python27\Lib\distutils\dist.py", line 972, in run_command
		cmd_obj.run()
	  File "<string>", line 15, in replacement_run
	  File "D:\Dev\AssetTools\git\env\lib\site-packages\setuptools\command\egg_info.py", line 193, in find_sources
		mm.run()
	  File "D:\Dev\AssetTools\git\env\lib\site-packages\setuptools\command\egg_info.py", line 279, in run
		self.read_template()
	  File "C:\Python27\Lib\distutils\command\sdist.py", line 316, in read_template
		self.filelist.process_template_line(line)
	  File "C:\Python27\Lib\distutils\filelist.py", line 118, in process_template_line
		action, patterns, dir, dir_pattern = self._parse_template_line(line)
	  File "C:\Python27\Lib\distutils\filelist.py", line 97, in _parse_template_line
		dir = convert_path(words[1])
	  File "C:\Python27\Lib\distutils\util.py", line 201, in convert_path
		raise ValueError, "path '%s' cannot end with '/'" % pathname
	ValueError: path 'silk/code_generation/' cannot end with '/'
	----------------------------------------
	Cleaning up...
	Command python setup.py egg_info failed with error code 1 in D:\Dev\AssetTools\git\env\src\silk
	Storing debug log for failure in C:\Users\joao\pip\pip.log

I was able to install with Pip from source from my fork after this change to the manifest file.