Add missing newline in Makefile

Author: jquast

Makefile

@@ -10,4 +10,4 @@ test-all-with-coverage:
 	@ rm -f -R tests/db/
 	@ echo '- creating new tests/db/ (required for tests)'
 	@ mkdir -p tests/db
-	@ nosetests --cover-package=sqlitedict --verbosity=1 --cover-erase --with-coverage 	
+	@ nosetests --cover-package=sqlitedict --verbosity=1 --cover-erase --with-coverage