Update procfs to v0.0.4-0.20190627154503-39e1aff1547e (prometheus#1409)

procfs v0.0.4-0.20190627154503-39e1aff1547e is a requirement for
prometheus#1357 (because procfs
v0.0.3 contained bug prometheus/procfs#187)

Signed-off-by: Benjamin Drung <benjamin.drung@cloud.ionos.com>

go.mod

@@ -17,7 +17,7 @@ require (
 	github.com/prometheus/client_golang v1.0.0
 	github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90
 	github.com/prometheus/common v0.4.1
-	github.com/prometheus/procfs v0.0.3
+	github.com/prometheus/procfs v0.0.4-0.20190627154503-39e1aff1547e
 	github.com/siebenmann/go-kstat v0.0.0-20160321171754-d34789b79745
 	github.com/sirupsen/logrus v1.4.2 // indirect
 	github.com/soundcloud/go-runit v0.0.0-20150630195641-06ad41a06c4a

go.sum

@@ -67,8 +67,8 @@ github.com/prometheus/common v0.4.1/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y8
 github.com/prometheus/procfs v0.0.0-20181005140218-185b4288413d/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
 github.com/prometheus/procfs v0.0.2 h1:6LJUbpNm42llc4HRCuvApCSWB/WfhuNo9K98Q9sNGfs=
 github.com/prometheus/procfs v0.0.2/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
-github.com/prometheus/procfs v0.0.3 h1:CTwfnzjQ+8dS6MhHHu4YswVAD99sL2wjPqP+VkURmKE=
-github.com/prometheus/procfs v0.0.3/go.mod h1:4A/X28fw3Fc593LaREMrKMqOKvUAntwMDaekg4FpcdQ=
+github.com/prometheus/procfs v0.0.4-0.20190627154503-39e1aff1547e h1:wHo3spLBVUEsk0etFRCYPI6CpKUZnxq0JwqXjaQhp/g=
+github.com/prometheus/procfs v0.0.4-0.20190627154503-39e1aff1547e/go.mod h1:4A/X28fw3Fc593LaREMrKMqOKvUAntwMDaekg4FpcdQ=
 github.com/prometheus/promu v0.2.0 h1:QKoCatPW0XeOG/9ghBv4qESc4G74NHCzuIzsm6SLVt4=
 github.com/prometheus/promu v0.2.0/go.mod h1:7vT+16au8n5E4UrtokdU7btmuJ1bF9df9F9s79Cgs3E=
 github.com/siebenmann/go-kstat v0.0.0-20160321171754-d34789b79745 h1:IuH7WumZNax0D+rEqmy2TyhKCzrtMGqbZO0b8rO00JA=