build(deps): Bump github.com/cosmos/iavl from 0.15.0 to 0.15.2

Bumps [github.com/cosmos/iavl](https://github.com/cosmos/iavl) from 0.15.0 to 0.15.2.
- [Release notes](https://github.com/cosmos/iavl/releases)
- [Changelog](https://github.com/cosmos/iavl/blob/master/CHANGELOG.md)
- [Commits](https://github.com/cosmos/iavl/compare/v0.15.0...v0.15.2)

Signed-off-by: dependabot[bot] <support@github.com>

go.mod

@@ -9,7 +9,7 @@ require (
 	github.com/btcsuite/btcd v0.21.0-beta
 	github.com/btcsuite/btcutil v1.0.2
 	github.com/confio/ics23/go v0.6.3
-	github.com/cosmos/iavl v0.15.0
+	github.com/cosmos/iavl v0.15.2
 	github.com/fortytw2/leaktest v1.3.0
 	github.com/go-kit/kit v0.10.0
 	github.com/go-logfmt/logfmt v0.5.0

go.sum

@@ -104,8 +104,8 @@ github.com/cosmos/iavl v0.15.0-rc3.0.20201009144442-230e9bdf52cd h1:K3bmPkMDnd2K
 github.com/cosmos/iavl v0.15.0-rc3.0.20201009144442-230e9bdf52cd/go.mod h1:3xOIaNNX19p0QrX0VqWa6voPRoJRGGYtny+DH8NEPvE=
 github.com/cosmos/iavl v0.15.0-rc5 h1:AMKgaAjXwGANWv56NL4q4hV+a0puSkLYD6cCQAv3i44=
 github.com/cosmos/iavl v0.15.0-rc5/go.mod h1:WqoPL9yPTQ85QBMT45OOUzPxG/U/JcJoN7uMjgxke/I=
-github.com/cosmos/iavl v0.15.0 h1:MKIZlwRuls9mUXnMCtqHRDsiZXeevUvDcVrxa1cw+8A=
-github.com/cosmos/iavl v0.15.0/go.mod h1:OLjQiAQ4fGD2KDZooyJG9yz+p2ao2IAYSbke8mVvSA4=
+github.com/cosmos/iavl v0.15.2 h1:caJFlSFRCgUDBavRL92JRILI2Lx+7zWxzKGY/CI2qxA=
+github.com/cosmos/iavl v0.15.2/go.mod h1:OLjQiAQ4fGD2KDZooyJG9yz+p2ao2IAYSbke8mVvSA4=
 github.com/cpuguy83/go-md2man v1.0.10/go.mod h1:SmD6nW6nTyfqj6ABTjUi3V3JVMnlJmwcJI5acqYI6dE=
 github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
@@ -280,8 +280,6 @@ github.com/hashicorp/logutils v1.0.0/go.mod h1:QIAnNjmIWmVIIkWDTG1z5v++HQmx9WQRO
 github.com/hashicorp/mdns v1.0.0/go.mod h1:tL+uN++7HEJ6SQLQ2/p+z2pH24WQKWjBPkE0mNTz8vQ=
 github.com/hashicorp/memberlist v0.1.3/go.mod h1:ajVTdAv/9Im8oMAAj5G31PhhMCZJV2pPBoIllUwCN7I=
 github.com/hashicorp/serf v0.8.2/go.mod h1:6hOLApaqBFA1NXqRQAsxw9QxuDEvNxSQRwA/JwenrHc=
-github.com/hdevalence/ed25519consensus v0.0.0-20200813231810-1694d75e712a h1:H7I/CTwAupJEX4g8AesPYRKQY0wbGZxQBlg842dGK3k=
-github.com/hdevalence/ed25519consensus v0.0.0-20200813231810-1694d75e712a/go.mod h1:V0zo781scjlo5OzNQb2GI8wMt6CD4vs7y1beXtxZEhM=
 github.com/hdevalence/ed25519consensus v0.0.0-20201207055737-7fde80a9d5ff h1:LeVKjw8pcDQj7WVVnbFvbD7ovcv+r/l15ka1NH6Lswc=
 github.com/hdevalence/ed25519consensus v0.0.0-20201207055737-7fde80a9d5ff/go.mod h1:Feit0l8NcNO4g69XNjwvsR0LGcwMMfzI1TF253rOIlQ=
 github.com/hpcloud/tail v1.0.0 h1:nfCOvKYfkgYP8hkirhJocXT2+zOD8yUNjXaWfTlyFKI=