Merge ~cjwatson/turnip:twisted-17.9.0 into turnip:master

[Colin Watson]

Upgrade to Twisted 17.9.0

[William Grant (wgrant)]

review: Approve (code)

diff --git a/requirements.txt b/requirements.txt
index 45c6863..10ab101 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,12 +1,14 @@
 appdirs==1.4.3
 asn1crypto==0.24.0
+attrs==17.4.0
+Automat==0.6.0
 beautifulsoup4==4.3.2
 cffi==1.11.4
 constantly==15.1.0
 contextlib2==0.4.0
 cornice==0.19.0
 cryptography==2.1.4
-docutils==0.12
+docutils==0.14
 enum34==1.1.6
 envdir==0.7
 extras==0.0.3
@@ -14,12 +16,15 @@ fixtures==1.0.0
 flake8==2.4.0
 gmpy==1.17
 gunicorn==19.3.0
+hyperlink==18.0.0
 idna==2.6
 incremental==17.5.0
 ipaddress==1.0.19
 lazr.sshserver==0.1.7
 linecache2==1.0.0
+m2r==0.1.14
 mccabe==0.3
+mistune==0.8.3
 Paste==2.0.2
 PasteDeploy==1.5.2
 pbr==1.8.1
@@ -37,12 +42,13 @@ python-mimeparse==0.1.4
 python-openid==2.2.5-fix1034376
 PyYAML==3.11
 repoze.lru==0.6
+setuptools-scm==1.17.0
 simplejson==3.6.5
 six==1.9.0
 testtools==1.8.1
 traceback2==1.4.0
 translationstring==1.3
-Twisted[conch]==16.5.0
+Twisted[conch]==17.9.0
 unittest2==1.0.1
 venusian==1.0
 waitress==0.8.9