Remove obsolete Group tag

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

snappy.spec

@@ -3,7 +3,6 @@ Version:        1.1.7
 Release:        6%{?dist}
 Summary:        Fast compression and decompression library
 
-Group:          System Environment/Libraries
 License:        BSD
 URL:            https://github.com/google/snappy
 Source0:        https://github.com/google/snappy/releases/download/%{version}/%{name}-%{version}.tar.gz
@@ -28,7 +27,6 @@ bigger.
 
 %package        devel
 Summary:        Development files for %{name}
-Group:          Development/Libraries
 Requires:       %{name}%{?_isa} = %{version}-%{release}
 Requires:       cmake-filesystem
 Requires:       pkgconfig