Changes:

• Update to Rust 1.48.0 #107

• Add type predicates #98

• Arithmetic predicates for number (Integer or Float) #95

• Add predicates to test value types #94

• Add duration query #90

• Add comparison predicates #89

Bugs Fixes:

• Serialization of cookie query for Expires attributes with hurlfmt #100

• Valid Jsonpath query is not parsed #93