chore: update libraries-bom version to 4.0.1 in README

Co-authored-by: Jeff Ching <chingor@google.com>

README.md

@@ -20,7 +20,7 @@ If you are using Maven with [BOM][libraries-bom], add this to your pom.xml file
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>libraries-bom</artifactId>
-      <version>4.0.0</version>
+      <version>4.0.1</version>
       <type>pom</type>
       <scope>import</scope>
     </dependency>

synth.metadata

@@ -1,13 +1,27 @@
 {
-  "updateTime": "2020-02-08T09:42:57.818742Z",
+  "updateTime": "2020-02-13T09:42:12.679195Z",
   "sources": [
+    {
+      "git": {
+        "name": ".",
+        "remote": "https://github.com/googleapis/java-billing.git",
+        "sha": "c0804d3e46c682f07d44a1e34fbc49f80a6b3706"
+      }
+    },
+    {
+      "git": {
+        "name": "synthtool",
+        "remote": "rpc://devrel/cloud/libraries/tools/autosynth",
+        "sha": "dd7cd93888cbeb1d4c56a1ca814491c7813160e8"
+      }
+    },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "e7d8a694f4559201e6913f6610069cb08b39274e",
-        "internalRef": "293903652",
-        "log": "e7d8a694f4559201e6913f6610069cb08b39274e\nDepend on the latest gapic-generator and resource names plugin.\n\nThis fixes the very old an very annoying bug: https://github.com/googleapis/gapic-generator/pull/3087\n\nPiperOrigin-RevId: 293903652\n\n806b2854a966d55374ee26bb0cef4e30eda17b58\nfix: correct capitalization of Ruby namespaces in SecurityCenter V1p1beta1\n\nPiperOrigin-RevId: 293903613\n\n1b83c92462b14d67a7644e2980f723112472e03a\nPublish annotations and grpc service config for Logging API.\n\nPiperOrigin-RevId: 293893514\n\n"
+        "sha": "0646bc775203077226c2c34d3e4d50cc4ec53660",
+        "internalRef": "294809380",
+        "log": "0646bc775203077226c2c34d3e4d50cc4ec53660\nRemove unnecessary languages from bigquery-related artman configuration files.\n\nPiperOrigin-RevId: 294809380\n\n8b78aa04382e3d4147112ad6d344666771bb1909\nUpdate backend.proto for schemes and protocol\n\nPiperOrigin-RevId: 294788800\n\n80b8f8b3de2359831295e24e5238641a38d8488f\nAdds artman config files for bigquerystorage endpoints v1beta2, v1alpha2, v1\n\nPiperOrigin-RevId: 294763931\n\n2c17ac33b226194041155bb5340c3f34733f1b3a\nAdd parameter to sample generated for UpdateInstance. Related to https://github.com/googleapis/python-redis/issues/4\n\nPiperOrigin-RevId: 294734008\n\nd5e8a8953f2acdfe96fb15e85eb2f33739623957\nMove bigquery datatransfer to gapic v2.\n\nPiperOrigin-RevId: 294703703\n\nefd36705972cfcd7d00ab4c6dfa1135bafacd4ae\nfix: Add two annotations that we missed.\n\nPiperOrigin-RevId: 294664231\n\n8a36b928873ff9c05b43859b9d4ea14cd205df57\nFix: Define the \"bigquery.googleapis.com/Table\" resource in the BigQuery Storage API (v1beta2).\n\nPiperOrigin-RevId: 294459768\n\nc7a3caa2c40c49f034a3c11079dd90eb24987047\nFix: Define the \"bigquery.googleapis.com/Table\" resource in the BigQuery Storage API (v1).\n\nPiperOrigin-RevId: 294456889\n\n5006247aa157e59118833658084345ee59af7c09\nFix: Make deprecated fields optional\nFix: Deprecate SetLoggingServiceRequest.zone in line with the comments\nFeature: Add resource name method signatures where appropriate\n\nPiperOrigin-RevId: 294383128\n\neabba40dac05c5cbe0fca3a35761b17e372036c4\nFix: C# and PHP package/namespace capitalization for BigQuery Storage v1.\n\nPiperOrigin-RevId: 294382444\n\nf8d9a858a7a55eba8009a23aa3f5cc5fe5e88dde\nfix: artman configuration file for bigtable-admin\n\nPiperOrigin-RevId: 294322616\n\n0f29555d1cfcf96add5c0b16b089235afbe9b1a9\nAPI definition for (not-yet-launched) GCS gRPC.\n\nPiperOrigin-RevId: 294321472\n\nfcc86bee0e84dc11e9abbff8d7c3529c0626f390\nfix: Bigtable Admin v2\n\nChange LRO metadata from PartialUpdateInstanceMetadata\nto UpdateInstanceMetadata. (Otherwise, it will not build.)\n\nPiperOrigin-RevId: 294264582\n\n6d9361eae2ebb3f42d8c7ce5baf4bab966fee7c0\nrefactor: Add annotations to Bigtable Admin v2.\n\nPiperOrigin-RevId: 294243406\n\nad7616f3fc8e123451c8b3a7987bc91cea9e6913\nFix: Resource type in CreateLogMetricRequest should use logging.googleapis.com.\nFix: ListLogEntries should have a method signature for convenience of calling it.\n\nPiperOrigin-RevId: 294222165\n\n63796fcbb08712676069e20a3e455c9f7aa21026\nFix: Remove extraneous resource definition for cloudkms.googleapis.com/CryptoKey.\n\nPiperOrigin-RevId: 294176658\n\n"
       }
     },
     {