Espalexa version 2.7.0

• Fixed discovery again (thank you @oponyx in PR #169 )

Espalexa version 2.6.0

• Fixed multiple Espalexa devices in Alexa groups (thank you @mrhill !)

Espalexa version 2.5.0

• Fixed discovery (thank you @lucaf86 !)
• Reduced usage of String class

Espalexa version 2.4.7

• Fixed ESP32 compilation

Espalexa version 2.4.6

• Reduce heap memory usage by 1.6kB
• Less use of String objects

Use v2.4.7 for ESP32!

Espalexa version 2.4.5

• Remove white channel handling that caused RGB to be black if White selected
• Fix ESP32 compilation

Espalexa v2.4.4

• Fix discovery on Echo Dot Gen 1 and 2
• Improve color temperature handling for RGBW

Espalexa v2.4.3

• Fixed devices not working in app, groups, and routines
  (implemented Sonoff Tasmota workaround)

Espalexa v2.4.2

• Fixed recent discovery issues

Espalexa v2.4.1

• Re-added the 2.2.0+ syntax for color callbacks