Update rapid to v0.4.5

Author: flyingmutant

go.mod

@@ -2,4 +2,4 @@ module pgregory.net/bdigest
 
 go 1.13
 
-require pgregory.net/rapid v0.4.0
+require pgregory.net/rapid v0.4.5

go.sum

@@ -1,2 +1,4 @@
 pgregory.net/rapid v0.4.0 h1:/boyXNQlDs1pmk7g1b9u2KrYqXnqjj0ARUDsZj5kapg=
 pgregory.net/rapid v0.4.0/go.mod h1:UYpPVyjFHzYBGHIxLFoupi8vwk6rXNzRY9OMvVxFIOU=
+pgregory.net/rapid v0.4.5 h1:Dej3+7kpi3p5/9dMouKspRs+K8EALKePW4/UYXKq8/4=
+pgregory.net/rapid v0.4.5/go.mod h1:UYpPVyjFHzYBGHIxLFoupi8vwk6rXNzRY9OMvVxFIOU=