fix: Exit tests after completion

See: https://stackoverflow.com/a/52143003

Author: Bartel-C8

package.json

@@ -92,8 +92,8 @@
     "build.native.debug": "cross-env CMAKE_BUILD_TYPE=Debug node-gyp configure --debug && cross-env CMAKE_BUILD_TYPE=Debug node-gyp build --debug",
     "build": "run-s build.js build.native",
     "build.debug": "run-s build.js build.native.debug",
-    "test": "run-s build && mocha",
-    "test.skip_gc_tests": "run-s build.debug && cross-env SKIP_GC_TESTS=true mocha",
+    "test": "run-s build && mocha --exit",
+    "test.skip_gc_tests": "run-s build.debug && cross-env SKIP_GC_TESTS=true mocha --exit",
     "test.electron.main": "run-s build && electron-mocha",
     "test.electron.renderer": "run-s build && electron-mocha --renderer",
     "lint.clang-format": "clang-format -i -style=file ./src/*.cc ./src/*.h ./src/util/*.h",