replace trailing whitespace with blackslash in README.md

As an alternative to the markdown trailing whitespace as a line
break, we use a trailing blackslash as a markdown line break.

1995/heathbar/README.md

@@ -1,9 +1,9 @@
 # Best Layout
 
-Heather Downs & Selene Makarios  
-The Software Bungalow  
-900 High School Way, #2202  
-Mountain View, CA 94041  
+Heather Downs & Selene Makarios\
+The Software Bungalow\
+900 High School Way, #2202\
+Mountain View, CA 94041\
 US
 
 ## To build: