update dependencies; minor fixes in README

[rafamizes]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.53%. Comparing base (2fdbbfd) to head (b1fa9e9).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@ Coverage Diff @@## master #176 +/- ##
=======================================
Coverage 99.52% 99.53% =======================================
Files 11 11 Lines 210 213 +3 =======================================
+ Hits 209 212 +3 
Misses 1 1 

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