- update to 2.1.0
  * Improvements and additions:
    - Patch #9187 improved the library coverage for the AVR_TINY
      architecture (ATtiny10 and relatives).  In particular, many
      of the functions from <string.h> are now available there.
          
    - Patch #8729 adds ISR_NOICF and ISR_FLATTEN to <avr/interrupt.h>
  * Bugs fixed:
    [#36933] Documentation no longer correctly describes how to declare
    [#41689] add static_assert to assert.h
    [#48898] power_usart3_* functions no more defined in power.h
    [#49020] dtostre() flags documentation error
    [#49447] Example code for uart_putchar() has error in recursive call
      strings for storage in program memory
    [#50439] avr/iom32u4.h does not define PRTIM4
    [#51755] iotn441.h & iotn841.h missing definitions for PUEA[0-7] and PUEB[0-3]
    [no-id] util/eu_dst.h: fix reversed DST decision logic for March and October
    [no-id] util/delay.h.in: add missing return
  
  * Contributed Patches:
    [no-id] Define weak symbols for known memory region sizes based on device 
      header definitions, starting with fuse region.
    [#8961] Update test script for new simulavr and library layout
    [#8964] Update tests isinf-01.c, signbit-01.c and modf-np.c
    [#9163] New eeprom write block function for xmega using eeprom page write
    [#8729] [avr/interrupt.h] Add ISR_NOICF, ISR_FLATTEN. Fix namespace
      of identifiers.
    [#8536] Fix a typo within <stdio.h>
    [#8649] small documentation fixes in
    [#9187] [AVR_TINY]: Support 16-bit xtoa functons and more string functions.
    [#9400] Add avrxmega3 multilibs
    [#9659] Update eeprom_is_ready for avrxmega3 devices
    [#9553] Fix some issues in libc/
    [#9864] Use proper float function names and prototypes (forwarded request 1035193 from kwk)

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