MatchingInOrder and MatchInAnyOrder are generics (#269)

LGTM.

Author: bukzor

src/hamcrest/library/collection/issequence_containinginanyorder.py

@@ -1,4 +1,4 @@
-from typing import MutableSequence, Optional, Sequence, TypeVar, Union, cast
+from typing import Generic, Optional, Sequence, TypeVar, Union
 
 from hamcrest.core.base_matcher import BaseMatcher
 from hamcrest.core.description import Description
@@ -12,11 +12,11 @@
 T = TypeVar("T")
 
 
-class MatchInAnyOrder(object):
+class MatchInAnyOrder(Generic[T]):
     def __init__(
         self, matchers: Sequence[Matcher[T]], mismatch_description: Optional[Description]
     ) -> None:
-        self.matchers = cast(MutableSequence[Matcher[T]], matchers[:])
+        self.matchers = list(matchers)
         self.mismatch_description = mismatch_description
 
     def matches(self, item: T) -> bool:

src/hamcrest/library/collection/issequence_containinginorder.py

@@ -1,5 +1,5 @@
 import warnings
-from typing import Optional, Sequence, TypeVar, Union
+from typing import Generic, Optional, Sequence, TypeVar, Union
 
 from hamcrest.core.base_matcher import BaseMatcher
 from hamcrest.core.description import Description
@@ -13,7 +13,7 @@
 T = TypeVar("T")
 
 
-class MatchingInOrder(object):
+class MatchingInOrder(Generic[T]):
     def __init__(
         self, matchers: Sequence[Matcher[T]], mismatch_description: Optional[Description]
     ) -> None: