v0.9.20

Changelog

bd2cb06 Update README.md
fc97079 interp: add support of interface wrappers to type assertions
538182e interp: fix append of values to an array of interface objects
f6d0cf9 interp: fix array declaration with a typed constant size
c503855 interp: fix handling of interface value in forwarding return calls
78d7e85 interp: fix method resolution on pointer to binary values
13d554a interp: fix receiver for exported method objects
4fcf90e interp: fix swap assign with extra operation
25b570d interp: fix the detection of builtin calls during parsing
77acfb4 interp: fix type checking of address of multi dimension array
297b40d interp: improve field and method resolution in presence of collisions.