dub upgrade doesn't upgrade openssl

dub upgrade wasn't upgrading openssl (Resulting in tons of deprecation warning with master).

````
geod24@barsoom2 ~/projects/vibe.d (git)-[master] % dub build
Package libevent can be upgraded from ~master to 2.0.1+2.0.16.
Package openssl can be upgraded from ~master to 1.1.3+1.0.1g.
Package libev can be upgraded from ~master to 4.0.0+4.04.
Use "dub upgrade" to perform those changes.
Selected package libevent ~master does not match the dependency specification in package vibe-d (>=2.0.1+2.0.16 <2.1.0). Need to "dub upgrade"?
Selected package openssl ~master does not match the dependency specification in package vibe-d (1.0.0+1.0.0e). Need to "dub upgrade"?
Selected package libev ~master does not match the dependency specification in package vibe-d (>=4.0.0+4.04 <4.1.0). Need to "dub upgrade"?
Building vibe-d 0.7.21+commit.7.gb96890c configuration "libevent", build type debug.
Running dmd...
Warning: -version=VibeDefaultMain will be required in the future to use vibe.d's default main(). Please update your build scripts.
^C


130 geod24@barsoom2 ~/projects/vibe.d (git)-[master] % dub upgrade                                                                                                  Upgrading project in /mnt/shared/projects/vibe.d


geod24@barsoom2 ~/projects/vibe.d (git)-[master] % dub build  
Package openssl can be upgraded from 1.0.0+1.0.0e to 1.1.3+1.0.1g.
Use "dub upgrade" to perform those changes.
Building vibe-d 0.7.21+commit.7.gb96890c configuration "libevent", build type debug.
Running dmd...
Warning: -version=VibeDefaultMain will be required in the future to use vibe.d's default main(). Please update your build scripts.
dub build  5.13s user 0.63s system 90% cpu 6.349 total
````