Merge pull request #235 from edgar-bonet/doc

Small documentation enhancements

README.md

@@ -65,9 +65,11 @@ https://learn.adafruit.com/the-well-automated-arduino-library/doxygen-tips
 The code should be formatted according to the [LLVM Coding Standards](https://llvm.org/docs/CodingStandards.html), which is the default of the clang-format tool.  The easiest way to ensure conformance is to [install clang-format](https://llvm.org/builds/) and run
 
 ```shell
-clang-format -i <source_file>`
+clang-format -i <source_file>
 ```
 
+See [Formatting with clang-format](https://learn.adafruit.com/the-well-automated-arduino-library/formatting-with-clang-format) for details.
+
 Written by JeeLabs
 MIT license, check license.txt for more information
 All text above must be included in any redistribution

src/RTClib.cpp

@@ -28,6 +28,7 @@
     - RTC_DS1307
     - RTC_DS3231
     - RTC_PCF8523
+    - RTC_PCF8563
   - RTC emulated in software; do not expect much accuracy out of these:
     - RTC_Millis is based on `millis()`
     - RTC_Micros is based on `micros()`; its drift rate can be tuned by