BLD Add scrapy 1.x target.

Author: rmax

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 # TODO: added redis-py version matrix.
-envlist = py{27,34,35}-scrapy{10,11,12,dev}
+envlist = py{27,34,35}-scrapy{10,11,12,1x,dev}
 
 [testenv]
 basepython =
@@ -15,5 +15,6 @@ commands =
     scrapy10: pip install scrapy>=1.0,<1.1
     scrapy11: pip install scrapy>=1.1,<1.2
     scrapy12: pip install scrapy>=1.2,<1.3
+    scrapy1x: pip install scrapy>=1.0,<2.0
     scrapydev: pip install https://github.com/scrapy/scrapy/archive/master.zip
     {posargs:coverage run -m py.test}