The `namespace` field is now required

package.json5

 {
     "$schema": "what",
     name: 'dds',
+    namespace: 'dds',
     version: '0.1.0',
     depends: {
         spdlog: '1.4.2',

tests/basics/test_basics.py

         {
             name: 'test-pkg',
             version: '0.2.2',
+            namespace: 'test',
         }
     ''')
 

tests/deps/git-remote/package.json5

 {
     name: 'deps-test',
+    "namespace": "test",
     version: '0.0.0',
     depends: {
         'neo-buffer': '0.1.0',

tests/deps/no-deps/package.json5

 {
     name: 'deps-test',
-    version: '0.0.0'
+    version: '0.0.0',
+    "namespace": "test",
 }

tests/deps/use-remote/package.json5

 {
     "name": "json-test",
     "version": "0.0.0",
+    "namespace": "test",
     "depends": {
         "nlohmann-json": "3.7.1"
     }

tests/deps/use-spdlog/project/package.json5

 {
     name: 'test',
     version: '0.0.0',
+    "namespace": "test",
     depends: {
         'spdlog': '1.4.2',
     },

tests/sdist/create/package.json5

 {
     name: 'foo',
     version: '1.2.3',
+    "namespace": "test",
 }

tests/test_drivers/catch/custom-runner/package.json5

 {
     "name": "test",
     "version": "0.0.0",
+    "namespace": "test",
     "test_driver": "Catch",
 }

tests/test_drivers/catch/main/package.json5

 {
     "name": "test",
     "version": "0.0.0",
+    "namespace": "test",
     "test_driver": "Catch-Main",
 }