Hide Query and QueryVariable type aliases (#475)

CHANGES/431.bugfix

@@ -0,0 +1 @@
+Hide `Query` and `QueryVariable` type aliases in `__init__.pyi`, now they are prefixed with underscore.

yarl/__init__.pyi

@@ -1,9 +1,9 @@
 from typing import overload, Any, Tuple, Optional, Mapping, Union, Sequence, Type
 import multidict
 
-QueryVariable = Union[str, int]
-Query = Union[
-    None, str, Mapping[str, QueryVariable], Sequence[Tuple[str, QueryVariable]]
+_QueryVariable = Union[str, int]
+_Query = Union[
+    None, str, Mapping[str, _QueryVariable], Sequence[Tuple[str, _QueryVariable]]
 ]
 
 class URL:
@@ -42,7 +42,7 @@ class URL:
         host: str = ...,
         port: Optional[int] = ...,
         path: str = ...,
-        query: Optional[Query] = ...,
+        query: Optional[_Query] = ...,
         query_string: str = ...,
         fragment: str = ...,
         encoded: bool = ...
@@ -56,7 +56,7 @@ class URL:
     def __gt__(self, other: Any) -> bool: ...
     def __hash__(self) -> int: ...
     def __truediv__(self, name: str) -> URL: ...
-    def __mod__(self, query: Query) -> URL: ...
+    def __mod__(self, query: _Query) -> URL: ...
     def is_absolute(self) -> bool: ...
     def is_default_port(self) -> bool: ...
     def origin(self) -> URL: ...
@@ -68,13 +68,13 @@ class URL:
     def with_port(self, port: Optional[int]) -> URL: ...
     def with_path(self, path: str, *, encoded: bool = ...) -> URL: ...
     @overload
-    def with_query(self, query: Query) -> URL: ...
+    def with_query(self, query: _Query) -> URL: ...
     @overload
-    def with_query(self, **kwargs: QueryVariable) -> URL: ...
+    def with_query(self, **kwargs: _QueryVariable) -> URL: ...
     @overload
-    def update_query(self, query: Query) -> URL: ...
+    def update_query(self, query: _Query) -> URL: ...
     @overload
-    def update_query(self, **kwargs: QueryVariable) -> URL: ...
+    def update_query(self, **kwargs: _QueryVariable) -> URL: ...
     def with_fragment(self, fragment: Optional[str]) -> URL: ...
     def with_name(self, name: str) -> URL: ...
     def join(self, url: URL) -> URL: ...