Add checklinks tox env and shell script. (#955)

Also clean up dead links.

1 files changed, 6 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 14dcc21..ea153e4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py35, py36, py37, py38, pypy3, flake8, checkspelling, pep517check
+envlist = py35, py36, py37, py38, pypy3, flake8, checkspelling, pep517check, checklinks
 isolated_build = True
 min_verison = 1.9
 
@@ -20,6 +20,11 @@ deps =
     mkdocs_nature
 commands = {toxinidir}/checkspelling.sh
 
+[testenv:checklinks]
+whitelist_externals = markdown-link-check
+deps =
+commands = {toxinidir}/checklinks.sh
+
 [testenv:pep517check]
 deps = pep517
 commands = python -m pep517.check {toxinidir}