v0.8.0

• added cut variable functionality to JSON keys, with also the option to reference
  multiple cut variables so long as the variables are all strings: "${KEY}${KEY_2}": "val_3"

0.7.4

• support multiple headers for gRPC requests

0.7.3

• changed valid cut variable regex from [A-Za-z_] to [A-Za-z_0-9] as alpha numerics were the intended format