llvmbot monitor: Add reformatting commit to blame ignore revs

Change-Id: I6997699202bf6a3e4a9ab74bbe6be70a6c2a2dca
diff --git a/monitor/.git-blame-ignore-revs b/monitor/.git-blame-ignore-revs
new file mode 100644
index 0000000..4192104
--- /dev/null
+++ b/monitor/.git-blame-ignore-revs
@@ -0,0 +1,2 @@
+# black reformatting
+4f932d15d3b0ca1c3827c84517b74188e084d004