phosphor-fan-presence: srcrev bump e81309d6b1..0891e3b3c1

Matthew Barth (2):
      Handle optional JSON configuration files
      monitor: Tach input to double

Change-Id: Ie4a99e9c88be53888ad04702e14ee3e4e3c56726
Signed-off-by: Andrew Geissler <openbmcbump-github@yahoo.com>
diff --git a/recipes-phosphor/fans/phosphor-fan.inc b/recipes-phosphor/fans/phosphor-fan.inc
index 7d3bcbd..09a3694 100644
--- a/recipes-phosphor/fans/phosphor-fan.inc
+++ b/recipes-phosphor/fans/phosphor-fan.inc
@@ -2,4 +2,4 @@
 LICENSE = "Apache-2.0"
 LIC_FILES_CHKSUM = "file://${S}/LICENSE;md5=e3fc50a88d0a364313df4b21ef20c29e"
 SRC_URI += "git://github.com/openbmc/phosphor-fan-presence"
-SRCREV = "e81309d6b1e50db5e762bcf0ca3634735fadd2c7"
+SRCREV = "0891e3b3c18fc7a612f67ce51742f6b1cf154cc2"