Update dependency polib to v1.1.1

This MR contains the following updates:

Package	Update	Change
polib	patch	==1.1.0 -> ==1.1.1

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Release Notes

izimobil/polib

v1.1.1

Compare Source

• Strip UTF-16 BOM (U+FEFF) from start of file
• Message context (msgctxt) support for MO files
• Dropped Python < 2.7 support
• Updated docs and README after switch from Bitbucket to Github

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