Use Go 1.19 / Remove deprecated API usage (#352)

Go 1.19 is out. Let's use it in the CI.

Also, this updates staticcheck version and removes deprecated API usage.

.github/workflows/go.yml

@@ -13,9 +13,9 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go: ["1.17.x", "1.18.x"]
+        go: ["1.17.x", "1.18.x", "1.19.x"]
         include:
-        - go: 1.18.x
+        - go: 1.19.x
           latest: true
 
     steps:

decorate.go

@@ -177,29 +177,32 @@ func (c *Container) Decorate(decorator interface{}, opts ...DecorateOption) erro
 // Scope, or completely replace it with a new object.
 //
 // For example,
-//  s.Decorate(func(log *zap.Logger) *zap.Logger {
-//    return log.Named("myapp")
-//  })
+//
+//	s.Decorate(func(log *zap.Logger) *zap.Logger {
+//	  return log.Named("myapp")
+//	})
 //
 // This takes in a value, augments it with a name, and returns a replacement for it. Functions
 // in the Scope's dependency graph that use *zap.Logger will now use the *zap.Logger
 // returned by this decorator.
 //
 // A decorator can also take in multiple parameters and replace one of them:
-//  s.Decorate(func(log *zap.Logger, cfg *Config) *zap.Logger {
-//    return log.Named(cfg.Name)
-//  })
+//
+//	s.Decorate(func(log *zap.Logger, cfg *Config) *zap.Logger {
+//	  return log.Named(cfg.Name)
+//	})
 //
 // Or replace a subset of them:
-//  s.Decorate(func(
-//    log *zap.Logger,
-//    cfg *Config,
-//    scope metrics.Scope
-//  ) (*zap.Logger, metrics.Scope) {
-//    log = log.Named(cfg.Name)
-//    scope = scope.With(metrics.Tag("service", cfg.Name))
-//    return log, scope
-//  })
+//
+//	s.Decorate(func(
+//	  log *zap.Logger,
+//	  cfg *Config,
+//	  scope metrics.Scope
+//	) (*zap.Logger, metrics.Scope) {
+//	  log = log.Named(cfg.Name)
+//	  scope = scope.With(metrics.Tag("service", cfg.Name))
+//	  return log, scope
+//	})
 //
 // Decorating a Scope affects all the child scopes of this Scope.
 //

dig_test.go

@@ -25,7 +25,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"math/rand"
 	"os"
 	"reflect"
@@ -165,7 +164,7 @@ func TestEndToEndSuccess(t *testing.T) {
 		c.RequireProvide(func() contents { return "hello world" })
 
 		c.RequireInvoke(func(buff *bytes.Buffer) {
-			out, err := ioutil.ReadAll(buff)
+			out, err := io.ReadAll(buff)
 			require.NoError(t, err, "read from buffer failed")
 			require.Equal(t, "hello world", string(out), "contents don't match")
 		})
@@ -656,7 +655,7 @@ func TestEndToEndSuccess(t *testing.T) {
 		c.RequireInvoke(
 			func(s fmt.Stringer, r io.Reader) {
 				require.Equal(t, "foo", s.String(), "invoke got new buffer")
-				got, err := ioutil.ReadAll(r)
+				got, err := io.ReadAll(r)
 				assert.NoError(t, err, "failed to read from reader")
 				require.Equal(t, "foo", string(got), "invoke got new buffer")
 			})