Update isort to 5.x release

Author: mvantellingen

codegen/main.py

@@ -5,7 +5,7 @@
 import astor
 import astunparse
 import black
-from isort import SortImports
+import isort.api
 
 from codegen.generate_schema import SchemaModuleGenerator
 from codegen.generate_services import ServiceModuleGenerator
@@ -100,7 +100,9 @@ def write_module(filename, ast):
 
 
 def reformat_code(filename):
-    SortImports(filename)
+
+    config = isort.api.Config()
+    isort.api.sort_file(filename, config=config)
 
     src = Path(filename)
     report = black.Report()

pyproject.toml

@@ -14,6 +14,3 @@ balanced_wrapping = true
 default_section = "THIRDPARTY"
 known_first_party = ["commercetools", "tests", "codegen"]
 use_parentheses = true
-indent_style = "space"
-indent_size = 4
-tab_width = 4

setup.py

@@ -20,7 +20,7 @@
     "astor==0.8.1",
     "attrs>=18.2.0",
     "black==18.9b0",
-    "isort[pyproject]==4.3.21",
+    "isort[pyproject]==5.2.2",
     "PyYAML==3.13",
 ]