Update README.md

PaulStoffregen · Jan 25, 2016 · 701ee87 · 701ee87
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diff --git a/README.md b/README.md
@@ -7,4 +7,6 @@ http://wp.josh.com/2014/06/23/no-external-pull-up-needed-for-ds18b20-temp-sensor
 
 To activate internal pull-up specify 
 
+```
 #define ONEWIRE_INTERNAL_PULLUP 1
+```