Bump snowballstemmer from 2.0.0 to 2.1.0

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Bumps snowballstemmer from 2.0.0 to 2.1.0.

Changelog

Sourced from snowballstemmer's changelog.

Snowball 2.1.0 (2021-01-21)

C/C++

• Fix decoding of 4-byte UTF-8 sequences in grouping checks. This bug affected Unicode codepoints U+40000 to U+7FFFF and U+C0000 to U+FFFFF and doesn't affect any of the stemming algorithms we currently ship (#138, reported by Stephane Carrez).

Python

• Fix snowballstemmer.algorithms() method (#132, reported by kkaiser).

• Update code to generate trove language classifiers for PyPI. All the natural languages we previously had stemmers for have now been added to PyPI's list, but Armenian and Yiddish aren't on it. Patch from Dmitry Shachnev.

Java

Code Quality Improvements

• Suppress GCC warning in compiler code.

• Use const pointers more in C runtime.

• Only use spaces for indentation in javascript code. Change proposed by Emily Marigold Klassen in #123, and seems to be the modern Javascript norm.

New Code Generators

• Add Ada generator from Stephane Carrez (#135).

New Snowball Language Features

• lenof and sizeof can now be applied to a literal string, which can be useful if you want to do calculations on cursor values.

  This change actually simplifies the language a little, since you can now use a literal string in any read-only context which accepts a string variable.

Code generation improvements

... (truncated)

Commits

• 4764395 Use more conventional tarball names
• e61d31e Strip trailing whitespace from NEWS entry
• abf838e Fill in the final steps for adding a new stemmer
• c560031 Update for release 2.1.0
• a6c3def [python] Resurrect mechanism to exclude classifiers
• 514b6d9 Merge Armenian stemmer
• dc5bf24 Yiddish: add comment to explain exception for GE and TSU
• 7c588cf ada: Make negative hop work as documented
• c39ea5a ada: Flag error for string literals we don't handle
• 4fcc25f Merge branch 'negative-hop'
• Additional commits viewable in compare view

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