Remove older libraries from Travis (for #151)
Remove older libraries from Travis (for #151)

markreidvfx/PyAV,mcpv/PyAV,markreidvfx/PyAV,xxr3376/PyAV,mikeboers/PyAV,mcpv/PyAV,pupil-labs/PyAV,PyAV-Org/PyAV,mcpv/PyAV,mikeboers/PyAV,markreidvfx/PyAV,pupil-labs/PyAV,PyAV-Org/PyAV,xxr3376/PyAV,pupil-labs/PyAV,xxr3376/PyAV,pupil-labs/PyAV