Update dependency charset-normalizer to ~=2.1.0

This MR contains the following updates:

Package	Update	Change
charset-normalizer	minor	~=2.0.0 -> ~=2.1.0

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Release Notes

ousret/charset_normalizer

v2.1.0

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Added

• Output the Unicode table version when running the CLI with --version (MR #​194)

Changed

• Re-use decoded buffer for single byte character sets from @​nijel (MR #​175)
• Fixing some performance bottlenecks from @​deedy5 (MR #​183)

Fixed

• Workaround potential bug in cpython with Zero Width No-Break Space located in Arabic Presentation Forms-B, Unicode 1.1 not acknowledged as space (MR #​175)
• CLI default threshold aligned with the API threshold from @​oleksandr-kuzmenko (MR #​181)

Removed

• Support for Python 3.5 (MR #​192)

Deprecated

• Use of backport unicodedata from unicodedata2 as Python is quickly catching up, scheduled for removal in 3.0 (MR #​194)

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