Finish sdk-1.6-compatibility

# Conflicts:
#	.travis.yml
#	appveyor.yml

Author: MrPointer

.travis.yml

@@ -3,7 +3,7 @@ os:
 - linux
 - osx
 env:
-- ARDUINO_SDK_VERSION=1.6.13
+- ARDUINO_SDK_VERSION=1.6.10
 - ARDUINO_SDK_VERSION=1.8.7
 addons:
   apt:

README.md

@@ -26,7 +26,7 @@ Then, in 2018, an extreme effort has been made and the project has been complete
 
 - **Platform-Independent** - The framework shouldn't assume it works only with the basic Arduino platform, as there are many others out there. Any platform that confront to the design of the basic Arduino SDK is appropriate for use. An example of such a platform is ESP32.
 - **Modern CMake** - All previous projects/forks have been using the fairly old CMake 2.8. CMake itself has transitioned much from version 2 to 3, benefiting from a whole lot of new exciting features. Even the official package managers support CMake 3 versions, so there's no excuse to not use it.
-- **Modern Arduino SDK** - The Arduino SDK, much like CMake, has also undergone several major changes during the years, especially with version 1.6. As this version came out as early as 2016, we consider it's perfectly valid to require users to refer to that version as our minimum requirement.
+- **Modern Arduino SDK** - The Arduino SDK, much like CMake, has also undergone several major changes during the years, especially with version 1.6. The Arduino SDK has only recently got stable, and that's why we recommend always having the latest version installed, although we do have some minimum requirements for the framework to even work. You can find them at the Requirements section.
 
 ### How it works
 
@@ -70,7 +70,9 @@ The following list is the basic requirements of the framework in order to use it
 
 * Windows, OS X or Linux (BSD support is currently unknown, use at your own risk)
 * CMake Version 3.8 or Higher
-* Arduino-Based SDK compatible with Arduino SDK Version 1.6 or Higher
+* Arduino-Based SDK compatible with Arduino SDK Version:
+  * 1.8.2 or Higher on **Microsoft Windows**
+  * 1.6.10 or Higher on **Linux** and **Apple OS X**
 
 ## Usage
 

appveyor.yml

@@ -3,8 +3,8 @@ image: Visual Studio 2017
 environment:
   MINGW_PATH: C:\mingw-w64\x86_64-7.2.0-posix-seh-rt_v5-rev1\mingw64\bin
   matrix:
-  #  - ARDUINO_SDK_VERSION: 1.6.13
-  - ARDUINO_SDK_VERSION: 1.8.7
+  - ARDUINO_SDK_VERSION: 1.8.2
+  - ARDUINO_SDK_VERSION: 1.8.6
 install:
 - ps: cinst unzip
 - ps: $env:ARDUINO_SDK_FILE = "arduino-$env:ARDUINO_SDK_VERSION-windows.zip"