Make fmeum the BCR maintainer (#249)

By also making me the `fixedReleaser`, BCR release automation should
work as it will use my fork.

.bcr/config.yml

diff --git a/.bcr/config.yml b/.bcr/config.yml
new file mode 100644
index 0000000..4225f4f
--- /dev/null
+++ b/.bcr/config.yml
@@ -0,0 +1,3 @@
+fixedReleaser:
+  login: fmeum
+  email: fabian@meumertzhe.im

.bcr/metadata.template.json

diff --git a/.bcr/metadata.template.json b/.bcr/metadata.template.json
index 418d75e..ca17a2a 100644
--- a/.bcr/metadata.template.json
+++ b/.bcr/metadata.template.json
@@ -2,9 +2,9 @@
   "homepage": "https://github.com/bazelbuild/rules_fuzzing",
   "maintainers": [
     {
-      "email": "sbucur@google.com",
-      "github": "stefanbucur",
-      "name": "Stefan Bucur"
+      "email": "fabian@meumertzhe.im",
+      "github": "fmeum",
+      "name": "Fabian Meumertzheim"
     }
   ],
   "versions": [],