Fixed #47 with recommended footprint change for U3, to increase minimum drill size to 0.3mm

Brequested to merge
bkpsu/satnogs-rotator-controller:master into master

Fixed #47 (closed) by changing footprint for U3 (TPS54360DDA) from HSOP-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.1mm to Texas_HSOP-8-1EP_3.9x4.9mm_P1.27mm_ThermalVias (drill hole is 0.3mm)

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