fix logrus capitalization issue (#43)

* fix logrus capitalization issue

Author: mcalhoun

glide.lock

@@ -1,4 +1,4 @@
-package: github.com/gruntwork-io/terraform-test
+package: github.com/gruntwork-io/terratest
 owners:
 - name: Gruntwork
   homepage: https://gruntwork.io
@@ -13,3 +13,7 @@ import:
   - aws/session
   - service/ec2
 - package: github.com/pquerna/otp
+- package: github.com/sirupsen/logrus
+- package: github.com/Sirupsen/logrus
+  repo: [email protected]:/sirupsen/logrus
+  vcs: git