Reference latest Lattice iCE Technology Library

Signed-off-by: Clifford Wolf <clifford@clifford.at>

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 <p>
 Recommended reading:
 <a href="http://www.latticesemi.com/~/media/LatticeSemi/Documents/DataSheets/iCE/iCE40LPHXFamilyDataSheet.pdf">Lattice iCE40 LP/HX Family Datasheet</a>,
-<a href="http://www.latticesemi.com/~/media/LatticeSemi/Documents/TechnicalBriefs/SBTICETechnologyLibrary201504.pdf">Lattice iCE Technology Library</a>
+<a href="http://www.latticesemi.com/~/media/LatticeSemi/Documents/TechnicalBriefs/SBTICETechnologyLibrary201608.pdf">Lattice iCE Technology Library</a>
 (Especially the three pages on "Architecture Overview", "PLB Blocks", "Routing", and "Clock/Control Distribution Network" in
 the Lattice iCE40 LP/HX Family Datasheet. Read that first, then come back here.)
 </p>