Resolve the byte compiling Emacs Lisp build error

[kentbull]

Looks like an unrelated test suite failure:

test 1
    Start 1: automated_tests
1: Test command: /home/travis/.local/bin/pytest "-svvv" "/home/travis/build/Andersbakken/rtags/tests/automated"
1: Environment variables: 
1:  RTAGS_BINARY_DIR=/home/travis/build/Andersbakken/rtags/build/bin
1: Test timeout computed to be: 1500
1: Traceback (most recent call last):
1:   File "/home/travis/.local/bin/pytest", line 7, in <module>
1:     from pytest import console_main
1:   File "/home/travis/.local/lib/python3.5/site-packages/pytest/__init__.py", line 3, in <module>
1:     from . import collect
1:   File "/home/travis/.local/lib/python3.5/site-packages/pytest/collect.py", line 8, in <module>
1:     from _pytest.deprecated import PYTEST_COLLECT_MODULE
1:   File "/home/travis/.local/lib/python3.5/site-packages/_pytest/deprecated.py", line 13, in <module>
1:     from _pytest.warning_types import PytestDeprecationWarning
1:   File "/home/travis/.local/lib/python3.5/site-packages/_pytest/warning_types.py", line 8, in <module>
1:     from _pytest.compat import final
1:   File "/home/travis/.local/lib/python3.5/site-packages/_pytest/compat.py", line 39
1:     NOTSET: "Final" = NotSetType.token  # noqa: E305
1:           ^
1: SyntaxError: invalid syntax
1/3 Test #1: automated_tests ..................***Failed    0.13 sec

Can we merge this anyway?

[Andersbakken]

Should be fixed now. Thanks.