new features:

• Add support for speechPlayer.
• Add more tests to check the various parts of espeak-ng.
• Various changes to clean up the codebase (Juho Hiltunen)
• Remove support for l_length_mods language option
• Restructure "option brackets" language option to "brackets" and "bracketsAnnounced"
• Restructure "stressLength" and "stressAdd" language option
• New Language option: "lowercaseSentence" for ending a sentence if a period is followed by a lower case letter
• Add voice variants
• Rename zh to cmn (Mandarin)
• Rename zhy to yue (Cantonese)
• cmn (Mandarin) now assumes all latin characters all English text Use cmn-latn-pinyin for interpreting latin characters as pinyin
• Update list of voice varants for Android application
• Add Chromium extension (guest271314)
• Replace ieee80.c by a free software implementation (Ulrich Müller)

bug fixes:

• Fix reading malformed SSML (Christopher Brannon)
• Fix memory allocation (Christopher Brannon)
• Fix building and phoneme compilation (John Bowler)
• Fix build scripts for Android (Peter Vágner, Minas Tirith Citizen)

documentation:

• Add documentation about voice and language options.
• Add documentation about dictionary flags.

updated languages:

• ar (Arabic) -- king-dahmanus
• ba (Bashkir) -- boracasli98, Valdis Vitolins, Juho Hiltunen
• cmn (Mandarin) -- Silas S. Brown, Rongcui Dong, Icenowy Zheng, Juho Hiltunen
• de (German) -- Karl Eick, Henry Krumb
• el (Modern Greek) -- Reece Dunn (support for variant Greek letter forms)
• en (English) -- Steven Presser, Ben Talagan
• eo (Esperanto) -- AlsoScratch
• eu (Basque) -- agonzalezd
• fa (Farsi/Persian) -- Shadyar Khodayari
• ga (Gaelic (Irish)) Chen, Chien-ting
• grc (Ancient Greek) -- Reece Dunn (support for variant Greek letter forms)
• hak (Hakka Chinese) -- Juho Hiltunen
• haw (Hawaiian) -- Juho Hiltunen
• ka (Georgian) -- Juho Hiltunen
• kok (Konkani) -- Juho Hiltunen
• nb (Norwegian Bokmål) -- Juho Hiltunen
• nci (Classical Nahuatl) -- Juho Hiltunen
• hy (Armenian) -- tigransimonyan
• ia (Interlingua) -- nesrad
• it (Italian) -- Christian Leo
• ja (Japanese) -- fukuen, Juho Hiltunen
• jbo (Lojban) -- Juho Hiltunen, xunsku
• lv (Latvian) -- Valdis Vitolins
• mi (Māori) -- boracasli98
• py (Pyash) -- Andrii Logan Zvorygin
• shn (Shan Tay Yai) -- ronaldaug
• tr (Turkish) -- boracasli98, SeanTolstoyevski
• ur (Urdu) -- Ejaz Shah
• uz (Uzbek) -- boracasli98, Valdis Vitolins, Andiv06
• yue (Cantonese) -- Andiv06

new languages:

• be (Belarusian) -- Sergei B
• chr (Cherokee) -- Michael Conrad
• cv (Chuvash) -- boracasli98, Valdis Vitolins
• en-us-nyc (English, New York City) -- Richard Calvi
• haw (Hawaiian) -- Valdis Vitolins
• he (Hebrew) -- boracasli98, Valdis Vitolins
• io (Ido) -- José Miguel López, Valdis Vitolins
• lb (Luxembourgish) -- Marco Barnig, Valdis Vitolins
• ltg (Latgalian) -- Valdis Vitolins
• nog (Nogai) -- boracasli98, Valdis Vitolins
• piqd (Klingon) -- Valdis Vitolins
• qu (Quechua) -- Valdis Vitolins
• qdb (Lang Belta) -- Da Def, Valdis Vitolins
• qya (Quenya) -- Lucas Werkmeister
• sjn (Sindarin) -- Lucas Werkmeister
• smj (Lule Saami) -- Katri Hiovain, Sebastien Le Maguer
• th (Thai) -- Valdis Vitolins
• tk (Turkmen) -- boracasli98, Valdis Vitolins
• ug (Uyghur) -- boracasli98, Valdis Vitolins
• uk (Ukrainian) -- Valdis Vitolins