Require Python 3.4+ and also test with Travis

- abc.ABC requires 3.4
- urllib3 depends on module _implemetation that isn't in 3.1
- Found some syntax errors when installing env for 3.1+3.2

Author: netromdk

.travis.yml

@@ -2,6 +2,7 @@ sudo: false
 language: python
 python:
 - '3.5'
+- '3.4'
 - '3.6'
 - nightly
 install:

Makefile

@@ -8,8 +8,8 @@ clean:
 	find . -iname __pycache__ | xargs rm -fr
 
 check-python-version:
-	@python3 -c 'import sys; sys.exit(0) if sys.version_info >= (3, 0) else sys.exit(1)'; \
-	if [ $$? -ne 0 ] ; then echo "Python 3 required"; exit 1 ; fi
+	@python3 -c 'import sys; sys.exit(0) if sys.version_info >= (3, 4) else sys.exit(1)'; \
+	if [ $$? -ne 0 ] ; then echo "Python 3.4 required"; exit 1 ; fi
 
 install: uninstall
 	ln -s "`pwd`/slacker.sh" /usr/local/bin/slacker
@@ -27,8 +27,8 @@ check-style:
 	flake8 --ignore E111,E114,E121,E126,E302 --max-line-length 100 --count --show-source \
 	  slacker slacker.py
 
-static_analysis:
+static-analysis:
 	vulture --min-confidence 60 --sort-by-size --exclude slacker/commands/__init__.py \
 	  slacker slacker.py .vulture_whitelist.py
 
-check: check-cmds check-style static_analysis
+check: check-cmds check-style static-analysis