* Update Tesla dependency and replace Poison with Jason
* Use new Tesla method to set headers
* Fix jason dependency definition
* Use list for Headers instead of a map
* Rollback to Poison because Jason does not support 'as:' option to decode to arbitrary struct
* Use new return signature from Tesla 1.0 in decode function
* catch error when a struct is given as second parameter to RequestBuilder.decode
* Update modules/openapi-generator/src/main/resources/elixir/request_builder.ex.mustache
Co-Authored-By: yknx4 <yknx.4.b@gmail.com>
* Update modules/openapi-generator/src/main/resources/elixir/request_builder.ex.mustache
Co-Authored-By: yknx4 <yknx.4.b@gmail.com>
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