build(deps): bump github.com/aws/aws-sdk-go in /tools/autograph-monitor

Bumps [github.com/aws/aws-sdk-go](https://github.com/aws/aws-sdk-go) from 1.34.18 to 1.34.20.
- [Release notes](https://github.com/aws/aws-sdk-go/releases)
- [Changelog](https://github.com/aws/aws-sdk-go/blob/master/CHANGELOG.md)
- [Commits](aws/aws-sdk-go@v1.34.18...v1.34.20)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

tools/autograph-monitor/go.mod

@@ -4,7 +4,7 @@ go 1.13
 
 require (
 	github.com/aws/aws-lambda-go v1.19.1
-	github.com/aws/aws-sdk-go v1.34.18
+	github.com/aws/aws-sdk-go v1.34.20
 	go.mozilla.org/autograph v0.0.0-20200224202955-7cd80491527d
 	go.mozilla.org/hawk v0.0.0-20190327210923-a483e4a7047e
 	go.mozilla.org/mar v0.0.0-20200124173325-c51ce05c9f3d

tools/autograph-monitor/go.sum

@@ -63,6 +63,8 @@ github.com/aws/aws-sdk-go v1.33.7 h1:vOozL5hmWHHriRviVTQnUwz8l05RS0rehmEFymI+/x8
 github.com/aws/aws-sdk-go v1.33.7/go.mod h1:5zCpMtNQVjRREroY7sYe8lOMRSxkhG6MZveU8YkpAk0=
 github.com/aws/aws-sdk-go v1.34.18 h1:Mo/Clq3u1dQFzpg8YQqBii8m+Vl3fWIfHi6kXs5wpuM=
 github.com/aws/aws-sdk-go v1.34.18/go.mod h1:5zCpMtNQVjRREroY7sYe8lOMRSxkhG6MZveU8YkpAk0=
+github.com/aws/aws-sdk-go v1.34.20 h1:D9otznteZZyN5pRyFETqveYia/85Xzk7+RaPGB1I9fE=
+github.com/aws/aws-sdk-go v1.34.20/go.mod h1:5zCpMtNQVjRREroY7sYe8lOMRSxkhG6MZveU8YkpAk0=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
 github.com/blang/semver v3.5.1+incompatible/go.mod h1:kRBLl5iJ+tD4TcOOxsy/0fnwebNt5EWlYSAyrTnjyyk=