Update mocha

package.json

@@ -47,7 +47,7 @@
     "nyc": "^12.0.2",
     "json-loader": "^0.5.7",
     "lint-staged": "^7.2.0",
-    "mocha": "^3.5.3",
+    "mocha": "^5.2.0",
     "mock-fs": "^4.5.0",
     "mssql": "^4.1.0",
     "mysql": "^2.15.0",
@@ -78,17 +78,17 @@
     "precommit": "lint-staged",
     "format": "prettier --write \"{src,bin,scripts,test}/**/*.js\"",
     "build": "npm run babel",
-    "debug_test": "node --inspect-brk ./node_modules/.bin/_mocha -t 0 test/index.js",
+    "debug_test": "node --inspect-brk ./node_modules/.bin/_mocha -- --exit -t 0 test/index.js",
     "babel": "rimraf ./lib && babel src --out-dir lib --copy-files",
     "coveralls": "nyc report --reporter=text-lcov | coveralls",
     "dev": "rimraf ./lib && babel -w src --out-dir lib --copy-files",
     "lint": "eslint src/**",
-    "plaintest": "mocha -t 10000 -b -R spec test/index.js && npm run tape",
+    "plaintest": "mocha --exit -t 10000 -b -R spec test/index.js && npm run tape",
     "prepublish": "npm run babel",
     "pre_test": "npm run lint",
     "tape": "node test/tape/index.js | tap-spec",
     "debug_tape": "node --inspect-brk test/tape/index.js",
-    "test": "npm run pre_test && nyc mocha --check-leaks -t 10000 -R spec test/index.js && npm run tape",
+    "test": "npm run pre_test && nyc mocha --exit --check-leaks -t 10000 -R spec test/index.js && npm run tape",
     "oracledb:test": "docker rmi -f --no-prune knex-test-oracledb && docker build -f scripts/oracle-tests-Dockerfile --tag knex-test-oracledb . && docker run --rm -i -t -e KNEX_TEST_TIMEOUT=$KNEX_TEST_TIMEOUT -e NODE_VER=$NODE_VER knex-test-oracledb",
     "mssql:init": "docker-compose -f scripts/mssql-docker-compose.yml up --no-start && docker-compose -f scripts/mssql-docker-compose.yml start",
     "postmssql:init": "node scripts/wait-for-mssql-server.js && npm run mssql:logs || (npm run mssql:logs;false)",