Fix layer version ARNs list

Author: txase

README.md

@@ -10,6 +10,7 @@ This is an early iteration of the PHP runtime Layer which is not yet ready for p
 When creating/updating a Lambda function you must specify  a specific version of the layer. This readme will be kept up to date with the latest version available. The latest available Lambda Layer Version ARNs for PHP 7.3 and 7.1 are:
 
 **arn:aws:lambda:\<region\>:887080169480:layer:php73:1**
+<br>
 **arn:aws:lambda:\<region\>:887080169480:layer:php71:8**
 
 See [Releases](https://github.com/stackery/php-lambda-layer/releases) for release notes.
@@ -189,4 +190,4 @@ then manually execute the commands in the build.sh file.
 > HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 > STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 > ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
-> OF THE POSSIBILITY OF SUCH DAMAGE.
+> OF THE POSSIBILITY OF SUCH DAMAGE.