maint: drop go 1.18 (#144)

## Which problem is this PR solving? upstream otel dropped support for go 1.18 in v1.15.0 ## Short description of the changes dropped 1.18 from CI ran `go mod tidy` with go 1.20 ## How to verify that this has the expected result tests pass
honeycombio · May 15, 2023 · 8ee9e89 · 8ee9e89
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diff --git a/.circleci/config.yml b/.circleci/config.yml
@@ -3,7 +3,7 @@ version: 2.1
 matrix_goversions: &matrix_goversions
   matrix:
     parameters:
-      goversion: ["18", "19", "20"]
+      goversion: ["19", "20"]
 
 default_goversion: &default_goversion "20"
 

diff --git a/examples/webhook-listener-triggers/go.mod b/examples/webhook-listener-triggers/go.mod
@@ -1,6 +1,6 @@
 module github.com/honeycombio/honeycomb-opentelemetry-go/examples/webhook-listener-triggers
 
-go 1.18
+go 1.20
 
 require (
 	github.com/gorilla/mux v1.8.0

diff --git a/go.mod b/go.mod
@@ -1,6 +1,6 @@
 module github.com/honeycombio/honeycomb-opentelemetry-go
 
-go 1.18
+go 1.20
 
 require (
 	github.com/honeycombio/otel-config-go v1.8.0