Fix typo in an example from README.md
Fix typo in an example from README.md

The change fixes a typo in python's True value name, which appers to
be lower-case in an example from README.md. This avoids a runtime
issue while trying to execute the example code snippet:

  NameError: name 'true' is not defined

Signed-off-by: Vladimir Zapolskiy <cab8e3b5e86fec6508364ac368c160d09cd3a3dc@mleia.com>

transceptor-technology/trender