Document IP lookup feature / Fix iplookup None bug

[slin63]

Short description of what this resolves:

Fixed yoda iplookup crashing when no argument was supplied.
Added README.md documentation as well as a link to the database used.

[codecov-io]

Codecov Report

Merging #160 into master will decrease coverage by 0.02%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master     #160      +/-   ##
==========================================
- Coverage   75.03%   75.01%   -0.03%     
==========================================
  Files          35       35              
  Lines        2359     2361       +2     
==========================================
+ Hits         1770     1771       +1     
- Misses        589      590       +1

Impacted Files	Coverage Δ
modules/dev.py	78.44% <50%> (-0.35%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5409930...4318bbe. Read the comment docs.