meta-phosphor: Add nholmann json depends

Change-Id: If2c791db29e1557c11df73024bf1ef0b9cae82df
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
diff --git a/recipes-phosphor/fans/phosphor-fan_git.bb b/recipes-phosphor/fans/phosphor-fan_git.bb
index e7c557a..ccb6989 100644
--- a/recipes-phosphor/fans/phosphor-fan_git.bb
+++ b/recipes-phosphor/fans/phosphor-fan_git.bb
@@ -22,6 +22,7 @@
 DEPENDS += "gpioplus"
 DEPENDS += "phosphor-logging"
 DEPENDS += "libevdev"
+DEPENDS += "nlohmann-json"
 
 # Package configuration
 FAN_PACKAGES = " \