remove package.cfg per new epel-playground policy

ocaml-sedlex.spec

@@ -1,6 +1,6 @@
 Name:           ocaml-sedlex
 Version:        2.1
-Release:        2%{?dist}
+Release:        3%{?dist}
 Summary:        Unicode-friendly lexer generator
 
 License:        MIT
@@ -15,7 +15,6 @@ BuildRequires:  ocaml-migrate-parsetree-devel
 BuildRequires:  ocaml-ppx-derivers-devel
 BuildRequires:  ocaml-ppx-tools-versioned-devel
 BuildRequires:  ocaml-gen-devel
-BuildRequires:  opam-installer
 
 %description
 A lexer generator for OCaml, similar to ocamllex, but supporting Unicode.
@@ -75,6 +74,9 @@ sed -i 's/"uchar"//g' $RPM_BUILD_ROOT%{_libdir}/ocaml/sedlex/opam
 
 
 %changelog
+* Sun Dec 15 2019 Andy Li <andy@onthewings.net> - 2.1-3
+- Remove unused BuildRequires on opam-installer.
+
 * Fri Nov 08 2019 Andy Li <andy@onthewings.net> - 2.1-2
 - Remove dependency on uchar.