opam: update to 2.1.0.

srcpkgs/opam/template

@@ -1,7 +1,7 @@
 # Template file for 'opam'
 pkgname=opam
-version=2.0.8
-revision=3
+version=2.1.0
+revision=1
 build_style=gnu-configure
 configure_args="--docdir=/usr/share/doc/${pkgname}"
 make_build_args="lib-ext all"
@@ -14,7 +14,7 @@ maintainer="Leah Neukirchen <leah@vuxu.org>"
 license="LGPL-3.0-only"
 homepage="http://opam.ocamlpro.com"
 distfiles="https://github.com/ocaml/${pkgname}/archive/${version}.tar.gz"
-checksum=846d595107949ccd4a144c970406b608762174df712a3d5571af704167dd8090
+checksum=456df1988dcad8a5ee99f4fe1f8791edc04df93225dbeb3d51bf87c5f47769a8
 nocross=yes
 disable_parallel_build=yes