Release v0.3.1

Scrapling v0.3.1 release notes

1. Fixed an issue with scrapling installation when you install it without the shell extra (#76 )
2. Added a new argument to all browser-based fetchers and their session classes to add a JS file to be executed on page creation (#56) :

from scrapling.fetchers import StealthyFetcher

StealthyFetcher.fetch('https://example.com', init_script="/absolute/path/to/js/script.js")

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