Remove obsolete Group tag

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

libvoikko.spec

@@ -3,7 +3,6 @@ Version:        4.1.1
 Release:        1%{?dist}
 Summary:        Voikko is a library for spellcheckers and hyphenators
 
-Group:          System Environment/Libraries
 License:        GPLv2+
 URL:            http://voikko.puimula.org
 # The usual format of stable release URLs
@@ -31,7 +30,6 @@ Hunspell.
 
 %package        devel
 Summary:        Development files for %{name}
-Group:          Development/Libraries
 Requires:       %{name}%{?_isa} = %{version}-%{release}
 Requires:       pkgconfig
 
@@ -41,7 +39,6 @@ developing applications that use %{name}.
 
 %package -n     voikko-tools
 Summary:        Test tools for %{name}
-Group:          Applications/Text
 Requires:       %{name}%{?_isa} = %{version}-%{release}
 
 %description -n voikko-tools
@@ -51,7 +48,6 @@ scripts.
 
 %package -n python3-libvoikko
 Summary:        Python interface to %{name}
-Group:          Development/Libraries
 Requires:       %{name} = %{version}-%{release}
 BuildArch:      noarch
 %{?python_provide:%python_provide python3-libvoikko}