Bump libgit2_0.28 obsoletes versions

Otherwise the updates fail due to file conflicts.

libgit2.spec

@@ -1,6 +1,6 @@
 Name:           libgit2
 Version:        0.28.4
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        C implementation of the Git core methods as a library with a solid API
 License:        GPLv2 with exceptions
 URL:            https://libgit2.org/
@@ -16,7 +16,7 @@ BuildRequires:  openssl-devel
 BuildRequires:  python3
 BuildRequires:  zlib-devel
 Provides:       bundled(libxdiff)
-Obsoletes:      libgit2_0.28 < 0.28.3-2
+Obsoletes:      libgit2_0.28 < 0.28.4-2
 
 %description
 libgit2 is a portable, pure C implementation of the Git core methods
@@ -27,7 +27,7 @@ with bindings.
 %package        devel
 Summary:        Development files for %{name}
 Requires:       %{name}%{?_isa} = %{?epoch:%{epoch}:}%{version}-%{release}
-Obsoletes:      libgit2_0.28-devel < 0.28.3-2
+Obsoletes:      libgit2_0.28-devel < 0.28.4-2
 
 %description    devel
 This package contains libraries and header files for
@@ -72,6 +72,9 @@ rm -frv deps
 %{_includedir}/git2/
 
 %changelog
+* Sun Mar 15 2020 Pete Walter <pwalter@fedoraproject.org> - 0.28.4-2
+- Bump libgit2_0.28 obsoletes versions
+
 * Wed Dec 11 09:00:52 CET 2019 Igor Gnatenko <ingnatenkobrain@fedoraproject.org> - 0.28.4-1
 - Update to 0.28.4