Merging upstream version 3.0.19.

Signed-off-by: Daniel Baumann <daniel@debian.org>

setup.py

@@ -11,7 +11,7 @@ with open(os.path.join(os.path.dirname(__file__), "README.rst")) as f:
 setup(
     name="ptpython",
     author="Jonathan Slenders",
-    version="3.0.16",
+    version="3.0.19",
     url="https://github.com/prompt-toolkit/ptpython",
     description="Python REPL build on top of prompt_toolkit",
     long_description=long_description,
@@ -20,10 +20,9 @@ setup(
         "appdirs",
         "importlib_metadata;python_version<'3.8'",
         "jedi>=0.16.0",
-        # Use prompt_toolkit 3.0.16, because of the `DeduplicateCompleter`.
-        "prompt_toolkit>=3.0.16,<3.1.0",
+        # Use prompt_toolkit 3.0.18, because of the `in_thread` option.
+        "prompt_toolkit>=3.0.18,<3.1.0",
         "pygments",
-        "black",
     ],
     python_requires=">=3.6",
     classifiers=[
@@ -47,5 +46,8 @@ setup(
             % sys.version_info[:2],
         ]
     },
-    extras_require={"ptipython": ["ipython"]},  # For ptipython, we need to have IPython
+    extras_require={
+        "ptipython": ["ipython"],  # For ptipython, we need to have IPython
+        "all": ["black"],  # Black not always possible on PyPy
+    },
 )