Fix font subset tag generation according to PDF spec #107
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According to the PDF 1.7 specification section 5.5.3 "Font Subsets", tag of a subset font should be 6 uppercase letters (e.g. ABCDEF).
https://opensource.adobe.com/dc-acrobat-sdk-docs/pdfstandards/pdfreference1.7old.pdf
In the current implementation, it is possible for tags to contain numbers and lowercase letters.