Update README.md

Remove spaces in the end of line.

README.md

@@ -52,7 +52,7 @@ _(after installation, the item is labeled as `"INSTALLED"` and can then be used
    c. modify platform.txt to enable float printf support:  
 add "-Wl,-u,vfprintf -lprintf_flt -lm" to "compiler.c.elf.flags=" before existing flag "-Wl,--gc-sections"  
 example:  
-`"compiler.c.elf.flags=-w -Os -Wl,-u,vfprintf -lprintf_flt -lm -Wl,--gc-sections"`  
+`"compiler.c.elf.flags=-w -Os -Wl,-u,vfprintf -lprintf_flt -lm -Wl,--gc-sections"`
 The file can be found in Arduino instalation directory, or after Arduino has been updated at:  
 "C:\Users\(user)\AppData\Local\Arduino15\packages\arduino\hardware\avr\(version)"
 If you can locate the file in both places, file from user profile is probably used.