Infer city + country from IP

[AlexandruValeanu]

Short description of what this resolves:

Infer city + country from IP (from the TODO list)

Changes proposed in this pull request:

• Add 'GeoLite2-City.mmdb' database
• Add iplookup function
• Add test for iplookup

[codecov-io]

Codecov Report

Merging #139 into master will increase coverage by 0.3%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #139     +/-   ##
=========================================
+ Coverage   74.02%   74.32%   +0.3%     
=========================================
  Files          32       33      +1     
  Lines        2252     2275     +23     
=========================================
+ Hits         1667     1691     +24     
+ Misses        585      584      -1

Impacted Files	Coverage Δ
modules/dev.py	76% <100%> (+2.31%)	⬆️
tests/dev/test_iplookup.py	100% <100%> (ø)
yoda.py	100% <100%> (ø)	⬆️
modules/util.py	73.33% <0%> (+1.11%)	⬆️

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[manparvesh]

@AlexandruValeanu
Thanks a lot for contributing! 😄 I'm merging this.