Update Enumerable#to_h type

[pocke]

Enumerable#to_h actually receives a block, but the type wasn't aware of the block.
So this pull request adds a method type to be aware of the block argument.

By the way, other to_hs support the block argument.

rbs/core/hash.rbs

Lines 857 to 858 in 967a421

	def to_h: () -> Hash[K, V]
	| [A, B] () { (K, V) -> [ A, B ] } -> Hash[A, B]

rbs/core/array.rbs

Lines 1855 to 1856 in 967a421

	def to_h: () -> Hash[untyped, untyped]
	| [T, S] () { (Elem) -> [T, S] } -> Hash[T, S]

[soutaro]

💯