Added software serial

Author: ed7coyne

.travis.yml

@@ -13,6 +13,8 @@ env:
 install:
 - if [ "$CXX" = "g++" ]; then export CXX="g++-4.8" CC="gcc-4.8"; fi
 - ( cd ${HOME} && curl -O https://downloads.arduino.cc/arduino-${ARDUINO_VERSION}-linux64.tar.xz && tar xvf arduino-${ARDUINO_VERSION}-linux64.tar.xz )
+- ( cd ${HOME} && wget -q -O SoftwareSerial.zip https://github.com/plerup/espsoftwareserial/archive/097712eb07f5b3a70ef419b6e7a7ed2ada5aab85.zip && unzip -q SoftwareSerial.zip
+  && rm -rf SoftwareSerial.zip && mv espsoftwareserial-* SoftwareSerial && mv SoftwareSerial ${ARDUINO_HOME}/libraries/)
 - git clone --branch ${ARDUINO_ESP8266_VERSION} https://github.com/esp8266/Arduino.git ${ARDUINO_ESP8266_ROOT}
 - git submodule init && git submodule update
 - ( cd ${ARDUINO_ESP8266_ROOT}/tools && python get.py )