Remove obsolete Group tag

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

libpst.spec

@@ -3,7 +3,6 @@ Name:               libpst
 Version:            0.6.72
 Release:            1%{?dist}
 License:            GPLv2+
-Group:              Applications/Productivity
 Source:             http://www.five-ten-sg.com/%{name}/packages/%{name}-%{version}.tar.gz
 BuildRoot:          %(mktemp -ud %{_tmppath}/%{name}-%{version}-%{release}-XXXXXX)
 URL:                http://www.five-ten-sg.com/%{name}/
@@ -31,7 +30,6 @@ Summation.
 
 %package libs
 Summary:            Shared library used by the pst utilities
-Group:              Development/Libraries
 
 %description libs
 The libpst-libs package contains the shared library used by the pst
@@ -47,7 +45,6 @@ Provides: %{name}-python = %{version}-%{release}
 Requires:           python
 %endif
 Summary:            Python bindings for libpst
-Group:              Development/Libraries
 Requires:           %{name}-libs = %{version}-%{release}
 
 %if 0%{?fedora} >= 20
@@ -71,7 +68,6 @@ from python code.
 
 %package devel
 Summary:            Library links and header files for libpst application development
-Group:              Development/Libraries
 Requires:           pkgconfig
 Requires:           %{name}-libs = %{version}-%{release}
 
@@ -84,7 +80,6 @@ utilities.
 
 %package devel-doc
 Summary:            Documentation for libpst.so for libpst application development
-Group:              Documentation
 Requires:           %{name}-doc = %{version}-%{release}
 
 %description devel-doc
@@ -94,7 +89,6 @@ documentation for the libpst.so shared library.
 
 %package doc
 Summary:            Documentation for the pst utilities in html format
-Group:              Documentation
 
 %description doc
 The libpst-doc package contains the html documentation for the pst