Merge pull request #252 from dtaylor84/patch-1

README: prevent shell expansion of $nrconf in example

README.raspberry.md

@@ -14,7 +14,7 @@ is a configuration option in needrestart to filter the kernel image filenames to
 ignore the unused image files. To filter the kernel image on a RPi 2 or RPi 3:
 
 ```shell
-$ cat << EOF > /etc/needrestart/conf.d/kernel.conf
+$ cat << 'EOF' > /etc/needrestart/conf.d/kernel.conf
 # Filter kernel image filenames by regex. This is required on Raspian having
 # multiple kernel image variants installed in parallel.
 $nrconf{kernelfilter} = qr(kernel7\.img);