Readme: use https links (#8954)

Author: imba-tjd

README.md

@@ -47,7 +47,7 @@ def fib(n: int) -> Iterator[int]:
         yield a
         a, b = b, a + b
 ```
-See [the documentation](http://mypy.readthedocs.io/en/stable/introduction.html) for more examples.
+See [the documentation](https://mypy.readthedocs.io/en/stable/introduction.html) for more examples.
 
 For Python 2.7, the standard annotations are written as comments:
 ```python
@@ -56,7 +56,7 @@ def is_palindrome(s):
     return s == s[::-1]
 ```
 
-See [the documentation for Python 2 support](http://mypy.readthedocs.io/en/latest/python2.html).
+See [the documentation for Python 2 support](https://mypy.readthedocs.io/en/latest/python2.html).
 
 Mypy is in development; some features are missing and there are bugs.
 See 'Development status' below.
@@ -73,7 +73,7 @@ In Ubuntu, Mint and Debian you can install Python 3 like this:
 
 For other Linux flavors, macOS and Windows, packages are available at
 
-  http://www.python.org/getit/
+  https://www.python.org/getit/
 
 
 Quick start
@@ -125,7 +125,7 @@ Mypy can be integrated into popular IDEs:
 Mypy can also be integrated into [Flake8] using [flake8-mypy], or
 can be set up as a pre-commit hook using [pre-commit mirrors-mypy].
 
-[Flake8]: http://flake8.pycqa.org/
+[Flake8]: https://flake8.pycqa.org/
 [flake8-mypy]: https://github.com/ambv/flake8-mypy
 [pre-commit mirrors-mypy]: https://github.com/pre-commit/mirrors-mypy
 
@@ -218,7 +218,7 @@ see "Troubleshooting" above.
 Working with the git version of mypy
 ------------------------------------
 
-mypy contains a submodule, "typeshed". See http://github.com/python/typeshed.
+mypy contains a submodule, "typeshed". See https://github.com/python/typeshed.
 This submodule contains types for the Python standard library.
 
 Due to the way git submodules work, you'll have to do
@@ -256,7 +256,7 @@ future.
 Changelog
 ---------
 
-Follow mypy's updates on the blog: http://mypy-lang.blogspot.com/
+Follow mypy's updates on the blog: https://mypy-lang.blogspot.com/
 
 
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