Hello all,

The ensembl 93 gtf (converted to GRanges on the fly) and fasta (twobit files) been added to AnnotationHub and are currently available in Bioc 3.8

Bioconductor version 3.8 (BiocManager 1.30.1), ?BiocManager::install for help
> library(AnnotationHub) 
> hub = AnnotationHub()
snapshotDate(): 2018-08-01
> length(query(hub, c("ensembl", "gtf", "release-93")))
[1] 288
> length(query(hub, c("fasta", "release-93", "twobit")))
[1] 463