Remove obsolete Group tag

References: https://fedoraproject.org/wiki/Changes/Remove_Group_Tag

stfl.spec

@@ -3,7 +3,6 @@ Version:        0.22
 Release:        30%{?dist}
 Summary:        The Structured Terminal Forms Language/Library
 
-Group:          System Environment/Libraries
 License:        LGPLv3+
 URL:            http://www.clifford.at/stfl/
 Source0:        http://www.clifford.at/stfl/%{name}-%{version}.tar.gz
@@ -23,7 +22,6 @@ terminals.
 
 %package        devel
 Summary:        Development files for %{name}
-Group:          Development/Libraries
 Requires:       %{name} = %{version}-%{release}
 Requires:       pkgconfig
 
@@ -34,7 +32,6 @@ developing applications that use %{name}.
 
 %package        perl
 Summary:        Perl binding for STFL
-Group:          Development/Libraries
 Requires:       %{name} = %{version}-%{release}
 
 %description    perl
@@ -43,7 +40,6 @@ Perl binding for STFL
 
 %package        ruby
 Summary:        Ruby binding for STFL
-Group:          Development/Libraries
 Requires:       %{name} = %{version}-%{release}
 Requires:       ruby(release)