Removed 3.4 builds.
Removed 3.4 builds.

RondaStrauch/landlab,Carralex/landlab,SiccarPoint/landlab,RondaStrauch/landlab,landlab/landlab,RondaStrauch/landlab,csherwood-usgs/landlab,amandersillinois/landlab,ManuSchmi88/landlab,cmshobe/landlab,cmshobe/landlab,csherwood-usgs/landlab,SiccarPoint/landlab,landlab/landlab,Carralex/landlab,cmshobe/landlab,landlab/landlab,amandersillinois/landlab,laijingtao/landlab,ManuSchmi88/landlab,laijingtao/landlab,Carralex/landlab,ManuSchmi88/landlab