Update README.md

Add ```pip install requests``` to install steps

Author: me-no-dev

README.md

@@ -33,6 +33,7 @@ Most of the framework is implemented. Most noticable is the missing analogWrite.
  curl -o get-pip.py https://bootstrap.pypa.io/get-pip.py && \
  sudo python get-pip.py && \
  sudo pip install pyserial && \
+ sudo pip install requests && \
  mkdir -p ~/Documents/Arduino/hardware/espressif && \
  cd ~/Documents/Arduino/hardware/espressif && \
  git clone https://github.com/espressif/arduino-esp32.git esp32 && \
@@ -51,6 +52,7 @@ Most of the framework is implemented. Most noticable is the missing analogWrite.
  wget https://bootstrap.pypa.io/get-pip.py && \
  sudo python get-pip.py && \
  sudo pip install pyserial && \
+ sudo pip install requests && \
  mkdir -p ~/Arduino/hardware/espressif && \
  cd ~/Arduino/hardware/espressif && \
  git clone https://github.com/espressif/arduino-esp32.git esp32 && \