Add QFN-28_4x4mm_P0.5mm
Created by: Ratfink
Needed for QFN28 STM32 microcontrollers. The Travis warning is bogus, due to https://github.com/KiCad/kicad-library-utils/pull/222 not being merged.
Datasheet: http://www.st.com/resource/en/datasheet/stm32f031k6.pdf (figure 41)
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