update badges

[gmartinonQM]

Description

Add several badges and update readme for installation instructions

Type of change

Please check options that are relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Visual inspection of the rendered README

Checklist:

• I have read the contributing guidelines
• I have updated the HISTORY.rst and AUTHORS.rst files
• Linting passes successfully : flake8 . --exclude=doc
• Typing passes successfully : mypy mapie examples --strict
• Unit tests pass successfully : pytest -vs --doctest-modules mapie
• Coverage is 100% : pytest -vs --doctest-modules --cov-branch --cov=mapie --pyargs mapie
• Documentation builds successfully : cd doc; make clean; make html

[codecov-commenter]

Codecov Report

Merging #66 (5ba572d) into master (bc380ca) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #66   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          554       554           
  Branches        42        42           
=========================================
  Hits           554       554           

---

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 bc380ca...5ba572d. Read the comment docs.

[vtaquet]

Cool ce nouveau badge !