Add version comparison test involving pre-releases

Author: martinholters

test/version.jl

@@ -116,6 +116,7 @@ import Base.issupbuild
 # basic comparison
 VersionNumber(2, 3, 1) == VersionNumber(Int8(2), UInt32(3), Int32(1)) == v"2.3.1"
 @test v"2.3.0" < v"2.3.1" < v"2.4.8" < v"3.7.2"
+@test v"0.6.0-" < v"0.6.0-dev" < v"0.6.0-dev.123" < v"0.6.0-dev.unknown" < v"0.6.0-pre" < v"0.6.0"
 
 #lowerbound and upperbound
 import Base: lowerbound, upperbound