Allow multiple specs above a single function clause

[Premwoik]

This PR addresses #74 and adds the possibility to have multiple specs per function clause. Previously it was possible to have only one spec per function clause.

This one refers to the #55 that introduced this feature.

Valid specs location

@spec convert(integer()) :: float()
@spec convert(atom()) :: binary()
def convert(int) when is_integer(int), do: int / 1

def convert(atom) when is_atom(atom), do: to_string(atom

@spec convert(integer()) :: float()
def convert(int) when is_integer(int), do: int / 1
@spec convert(atom()) :: binary()
def convert(atom) when is_atom(atom), do: to_string(atom)

Invalid specs location

@spec last_two(atom()) :: atom()
def last_three(:ok) do
  :ok
end

@spec last_two(atom()) :: atom()
@spec last_three(atom()) :: atom()
def last_three(:ok) do
  :ok
end

[erszcz]

Awesome 👍