feat: add support for pyls-mypy

lib/main.js

@@ -83,6 +83,7 @@ class PythonLanguageClient extends AutoLanguageClient {
             "Make sure to install `pyls` 0.19 or newer by running:\n" +
             "```\n" +
             `${python} -m pip install 'python-language-server[all]'\n` +
+            `${python} -m pip install git+https://github.com/tomv564/pyls-mypy.git\n` +
             "```",
         })
       }

package.json

@@ -443,6 +443,26 @@
             }
           }
         },
+        "pyls_mypy": {
+          "title": "MyPy",
+          "type": "object",
+          "properties": {
+            "enabled": {
+              "title": "Enabled",
+              "type": "boolean",
+              "order": 1,
+              "default": true,
+              "description": "Enable or disable MyPy."
+            },
+            "live_mode": {
+              "title": "Live mode",
+              "type": "boolean",
+              "order": 1,
+              "default": true,
+              "description": "Turn on live mode. If disabled, mypy linters on file save. Note: Linting on file save may not work on all machines."
+            }
+          }
+        },
         "flake8": {
           "title": "Flake8",
           "type": "object",