Escape macros in %changelog

Reference: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/thread/Y2ZUKK2B7T2IKXPMODNF6HB2O5T5TS6H/
Signed-off-by: Igor Gnatenko <ignatenkobrain@fedoraproject.org>

pngquant.spec

@@ -2,7 +2,7 @@
 
 Name:           pngquant
 Version:        2.11.7
-Release:        2%{?dist}
+Release:        3%{?dist}
 Summary:        PNG quantization tool for reducing image file size
 
 License:        GPLv3+
@@ -55,6 +55,9 @@ export CFLAGS="%{optflags} -fno-math-errno -funroll-loops -fomit-frame-pointer -
 
 
 %changelog
+* Fri Feb 09 2018 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 2.11.7-3
+- Escape macros in %%changelog
+
 * Fri Feb 09 2018 Fedora Release Engineering <releng@fedoraproject.org> - 2.11.7-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild
 
@@ -182,7 +185,7 @@ export CFLAGS="%{optflags} -fno-math-errno -funroll-loops -fomit-frame-pointer -
 
 * Sun Apr 19 2015 Sérgio Basto <sergio@serjux.com> - 2.4.0.1-2
 - Fixed dependency of libimagequant.so.0
-- Minor fix on ln to %{libname}.so
+- Minor fix on ln to %%{libname}.so
 
 * Sun Apr 19 2015 Sérgio Basto <sergio@serjux.com> - 2.4.0.1-1
 - Update to 2.4.0