update devdeps to latest, update babylon (#6012)

* temporary flow strip measure

packages/babel-plugin-transform-es2015-parameters/test/fixtures/use-loose-option/default-assignment-with-types/actual.js

@@ -0,0 +1,4 @@
+export function transformFileSync(
+  filename: string,
+  opts?: Object = {},
+): string {}

packages/babel-plugin-transform-es2015-parameters/test/fixtures/use-loose-option/default-assignment-with-types/expected.js

@@ -0,0 +1,5 @@
+export function transformFileSync(filename, opts) {
+  if (opts === void 0) {
+    opts = {};
+  }
+}

packages/babel-plugin-transform-es2015-parameters/test/fixtures/use-loose-option/default-assignment-with-types/options.json

@@ -0,0 +1,6 @@
+{
+  "plugins": [
+    "transform-flow-strip-types",
+    ["transform-es2015-parameters", { "loose": true } ]
+  ]
+}