Update go version to 1.20 (#58)

Author: cristinaleonr

.travis.yml

@@ -1,7 +1,7 @@
 language: go
 
 go:
-- 1.18
+- 1.20
 
 install:
 - go get -v -t ./...

Dockerfile

@@ -1,5 +1,5 @@
 # Build uuid-annotator
-FROM golang:1.18 as build
+FROM golang:1.20 as build
 COPY . /go/src/github.com/m-lab/uuid-annotator
 WORKDIR /go/src/github.com/m-lab/uuid-annotator
 RUN go get -v . && \

go.mod

@@ -1,6 +1,6 @@
 module github.com/m-lab/uuid-annotator
 
-go 1.18
+go 1.20
 
 require (
 	github.com/go-test/deep v1.0.6