Invalid assertion in dependency

[dpryan79]

I'm running into the following error in the 0.3.4 release (bioconda/bioconda-recipes#28432 ):

13:20:14 BIOCONDA INFO (OUT) pkg/mod/github.com/golang/dep@v0.5.4/gps/constraint.go:103:21: cannot use sv (type *semver.Version) as type semver.Version in field value
13:20:14 BIOCONDA INFO (OUT) pkg/mod/github.com/golang/dep@v0.5.4/gps/constraint.go:122:16: invalid type assertion: c.(semver.Version) (non-interface type *semver.Constraints on left)
13:20:14 BIOCONDA INFO (OUT) pkg/mod/github.com/golang/dep@v0.5.4/gps/constraint.go:149:4: undefined: semver.Constraint

I assume the gps dependency version could be restricted to avoid this.