Release v1.5.0

Merge pull request cloudflare#1054 from dsix-work/musl-builds

Build staticly with musl for better compatibility

Merge pull request cloudflare#1048 from cloudflare/cbroglie/goreleaser

Support building/releasing binaries with goreleaser

Merge pull request cloudflare#1047 from cloudflare/cbroglie/modules

Migrate to Go modules

Release 1.3.4

Release 1.3.3

Release 1.3.2.

Merge pull request cloudflare#863 from cloudflare/cbroglie/go1.10

Fix Go 1.10 build errors

Checkout cfssl-trust in Dockerfile.

Merge pull request cloudflare#567 from cloudflare/nick/1.2

Bump version to 1.2