drop useless Group tags

libe-book.spec

@@ -5,7 +5,6 @@ Version: 0.1.1
 Release: 1%{?dist}
 Summary: A library for import of reflowable e-book formats
 
-Group: System Environment/Libraries
 License: MPLv2.0
 URL: https://sourceforge.net/projects/libebook/
 Source: http://downloads.sourceforge.net/libebook/%{name}-%{version}.tar.xz
@@ -27,7 +26,6 @@ FictionBook v.2, TCR, zTXT.
 
 %package devel
 Summary: Development files for %{name}
-Group: Development/Libraries
 Requires: %{name}%{?_isa} = %{version}-%{release}
 
 %description devel
@@ -36,7 +34,6 @@ developing applications that use %{name}.
 
 %package doc
 Summary: Documentation of %{name} API
-Group: Documentation
 BuildArch: noarch
 
 %description doc
@@ -44,7 +41,6 @@ The %{name}-doc package contains documentation files for %{name}.
 
 %package tools
 Summary: Tools to transform e-books into other formats
-Group: Applications/Publishing
 Requires: %{name}%{?_isa} = %{version}-%{release}
 
 %description tools