Bump github.com/DataDog/datadog-go from 3.5.0+incompatible to 3.7.2+incompatible in /exporters/metric/datadog (#78)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Evan Torrie <evantorrie@users.noreply.github.com>

Author: dependabot[bot]

exporters/metric/datadog/go.mod

@@ -3,7 +3,7 @@ module go.opentelemetry.io/contrib/exporters/metric/datadog
 go 1.14
 
 require (
-	github.com/DataDog/datadog-go v3.5.0+incompatible
+	github.com/DataDog/datadog-go v3.7.2+incompatible
 	github.com/DataDog/sketches-go v0.0.0-20190923095040-43f19ad77ff7
 	go.opentelemetry.io/otel v0.6.0
 )

exporters/metric/datadog/go.sum

@@ -1,7 +1,7 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/DataDog/datadog-go v3.5.0+incompatible h1:AShr9cqkF+taHjyQgcBcQUt/ZNK+iPq4ROaZwSX5c/U=
-github.com/DataDog/datadog-go v3.5.0+incompatible/go.mod h1:LButxg5PwREeZtORoXG3tL4fMGNddJ+vMq1mwgfaqoQ=
+github.com/DataDog/datadog-go v3.7.2+incompatible h1:o4QtYjBU/rG58VPh8Ne6F65YiMY5/v5q4WdY/HvRYMQ=
+github.com/DataDog/datadog-go v3.7.2+incompatible/go.mod h1:LButxg5PwREeZtORoXG3tL4fMGNddJ+vMq1mwgfaqoQ=
 github.com/DataDog/sketches-go v0.0.0-20190923095040-43f19ad77ff7 h1:qELHH0AWCvf98Yf+CNIJx9vOZOfHFDDzgDRYsnNk/vs=
 github.com/DataDog/sketches-go v0.0.0-20190923095040-43f19ad77ff7/go.mod h1:Q5DbzQ+3AkgGwymQO7aZFNP7ns2lZKGtvRBzRXfdi60=
 github.com/benbjohnson/clock v1.0.0 h1:78Jk/r6m4wCi6sndMpty7A//t4dw/RW5fV4ZgDVfX1w=