Add valelab4.ucsf.edu to linkcheck_ignore

[will-moore]

Cert expired

[snoopycrimecop]

Conflicting PR. Removed from build BIOFORMATS-push#94. See the console output for more details. Possible conflicts:

• PR #330 jburel 'update uri'
  • sphinx/conf.py
• PR #332 dgault 'Add xuvtools.org to ignore list'
  • sphinx/conf.py

--conflicts

[snoopycrimecop]

Conflicting PR. Removed from build BIOFORMATS-push#22. See the console output for more details. Possible conflicts:

• PR #330 jburel 'update uri'
  • sphinx/conf.py
• PR #332 dgault 'Add xuvtools.org to ignore list'
  • sphinx/conf.py

--conflicts Conflict resolved in build BIOFORMATS-push#100. See the console output for more details.