Merge pull request #1750 from plerup/master

Update SoftwareSerial to version 3.1.0

Author: igrr

package/build_boards_manager_package.sh

@@ -47,7 +47,7 @@ rm exclude.txt
 # Get additional libraries (TODO: add them as git submodule or subtree?)
 
 # SoftwareSerial version 2.2
-wget -q -O SoftwareSerial.zip https://github.com/plerup/espsoftwareserial/archive/306b3f640296f3105a79bcc11d0fd185c95be1c9.zip
+wget -q -O SoftwareSerial.zip https://github.com/plerup/espsoftwareserial/archive/097712eb07f5b3a70ef419b6e7a7ed2ada5aab85.zip
 unzip -q SoftwareSerial.zip
 rm -rf SoftwareSerial.zip
 mv espsoftwareserial-* SoftwareSerial