Add 'make lint' target.

Makefile

@@ -1,14 +1,15 @@
 VERSION = $(shell grep -oE "[0-9]+\.[0-9]+\.[0-9]+" bin/autojump)
 TAGNAME = release-v$(VERSION)
 
-.PHONY: clean docs install uninstall pre-commit lint tar test
+.PHONY: install
-
 install:
 	./install.py
 
+.PHONY: uninstall
 uninstall:
 	./uninstall.py
 
+.PHONY: docs
 docs:
 	pandoc -s -w man docs/manpage_header.md docs/header.md docs/body.md -o docs/autojump.1
 	pandoc -s -w markdown docs/header.md docs/install.md docs/body.md -o README.md
@@ -17,9 +18,11 @@ docs:
 lint: pre-commit
 	@tox -e pre-commit -- run --all-files
 
+.PHONY: pre-commit
 pre-commit:
 	@tox -e pre-commit -- install -f --install-hooks
 
+.PHONY: release
 release: docs
 	# Check for tag existence
 	# git describe release-$(VERSION) 2>&1 >/dev/null || exit 1
@@ -37,20 +40,25 @@ release: docs
 	git archive --format=tar --prefix autojump_v$(VERSION)/ $(TAGNAME) | gzip > autojump_v$(VERSION).tar.gz
 	sha1sum autojump_v$(VERSION).tar.gz
 
+.PHONY: tar
 tar:
 	# Create tagged archive
 	git archive --format=tar --prefix autojump_v$(VERSION)/ $(TAGNAME) | gzip > autojump_v$(VERSION).tar.gz
 	sha1sum autojump_v$(VERSION).tar.gz
 
+.PHONY: test
 test: pre-commit
 	@tox
 
+.PHONY: test-xfail
 test-xfail: pre-commit
 	@tox -- --runxfail
 
+.PHONY: test-fast
 test-fast: pre-commit
 	@tox -e py27
 
+.PHONY: clean
 clean:
 	@find . -type f -iname '*.py[co]' -delete
 	@find . -type d -iname '__pycache__' -delete