fix the headlines

Author: annetmyshkina

README.md

@@ -4,23 +4,23 @@
 # Brain games
 includes five mini-games:
 
-##"Parity Check"
+### "Parity Check"
 
 [![asciicast](https://asciinema.org/a/FmjPz2ek6om6cO2LW04rxPVWz.svg)](https://asciinema.org/a/FmjPz2ek6om6cO2LW04rxPVWz)
 
-##"Calculator"
+### "Calculator"
 
 [![asciicast](https://asciinema.org/a/XG4UsNQPwcvdQkba7YJVbNdUB.svg)](https://asciinema.org/a/XG4UsNQPwcvdQkba7YJVbNdUB)
 
-##"Greatest Common Divisor"
+### "Greatest Common Divisor"
 
 [![asciicast](https://asciinema.org/a/URSm62jaBPbXL7gXS76C3MuDU.svg)](https://asciinema.org/a/URSm62jaBPbXL7gXS76C3MuDU)
 
-##"Arithmetic progression"
+### "Arithmetic progression"
 
 [![asciicast](https://asciinema.org/a/PXHQlaINEHoMeeLjk4CGBP3tv.svg)](https://asciinema.org/a/PXHQlaINEHoMeeLjk4CGBP3tv)
 
-##"Is a prime number?"
+### "Is a prime number?"
 
 [![asciicast](https://asciinema.org/a/bX5DZ1mlRLSx4PLoYAGi1EPUo.svg)](https://asciinema.org/a/bX5DZ1mlRLSx4PLoYAGi1EPUo)