v0.6.7

Supported floating operation

It may be helpful for some people.

🍣 echo $(( 1.0 / 2  ))
0.5
🍣 echo $(( 1 / 2  ))
0
🍣 A=1.1 ; echo $(( A*3  ))
3.3000000000000003
🍣 echo $(( 1.1**1.1 ))
1.1105342410545758

Enjoy.