Update go.mod to go 1.18

go.mod

@@ -1,19 +1,37 @@
 module github.com/jackc/tern
 
-go 1.13
+go 1.18
 
 require (
-	github.com/Masterminds/goutils v1.1.0 // indirect
-	github.com/Masterminds/semver v1.5.0 // indirect
 	github.com/Masterminds/sprig v2.22.0+incompatible
-	github.com/google/uuid v1.1.1 // indirect
-	github.com/huandu/xstrings v1.3.2 // indirect
-	github.com/imdario/mergo v0.3.9 // indirect
 	github.com/jackc/pgconn v1.6.1
 	github.com/jackc/pgx/v4 v4.7.1
-	github.com/mitchellh/copystructure v1.0.0 // indirect
 	github.com/spf13/cobra v1.4.0
 	github.com/stretchr/testify v1.6.1
 	github.com/vaughan0/go-ini v0.0.0-20130923145212-a98ad7ee00ec
 	golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83
 )
+
+require (
+	github.com/Masterminds/goutils v1.1.0 // indirect
+	github.com/Masterminds/semver v1.5.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/google/uuid v1.1.1 // indirect
+	github.com/huandu/xstrings v1.3.2 // indirect
+	github.com/imdario/mergo v0.3.9 // indirect
+	github.com/inconshreveable/mousetrap v1.0.0 // indirect
+	github.com/jackc/chunkreader/v2 v2.0.1 // indirect
+	github.com/jackc/pgio v1.0.0 // indirect
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgproto3/v2 v2.0.2 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20200307190119-3430c5407db8 // indirect
+	github.com/jackc/pgtype v1.4.0 // indirect
+	github.com/mitchellh/copystructure v1.0.0 // indirect
+	github.com/mitchellh/reflectwalk v1.0.0 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae // indirect
+	golang.org/x/text v0.3.3 // indirect
+	golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
+)

go.sum

@@ -26,7 +26,6 @@ github.com/imdario/mergo v0.3.9 h1:UauaLniWCFHWd+Jp9oCEkTBj8VO/9DKg3PV3VCNMDIg=
 github.com/imdario/mergo v0.3.9/go.mod h1:2EnlNZ0deacrJVfApfmtdGgDfMuh/nq6Ok1EcJh5FfA=
 github.com/inconshreveable/mousetrap v1.0.0 h1:Z8tu5sraLXCXIcARxBp/8cbvlwVa7Z1NHg9XEKhtSvM=
 github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
-github.com/jackc/chunkreader v1.0.0 h1:4s39bBR8ByfqH+DKm8rQA3E1LHZWB9XWcrz8fqaZbe0=
 github.com/jackc/chunkreader v1.0.0/go.mod h1:RT6O25fNZIuasFJRyZ4R/Y2BbhasbmZXF9QQ7T3kePo=
 github.com/jackc/chunkreader/v2 v2.0.0/go.mod h1:odVSm741yZoC3dpHEUXIqA9tQRhFrgOHwnPIn9lDKlk=
 github.com/jackc/chunkreader/v2 v2.0.1 h1:i+RDz65UE+mmpjTfyz0MoVTnzeYxroil2G82ki7MGG8=
@@ -45,7 +44,6 @@ github.com/jackc/pgmock v0.0.0-20190831213851-13a1b77aafa2 h1:JVX6jT/XfzNqIjye47
 github.com/jackc/pgmock v0.0.0-20190831213851-13a1b77aafa2/go.mod h1:fGZlG77KXmcq05nJLRkk0+p82V8B8Dw8KN2/V9c/OAE=
 github.com/jackc/pgpassfile v1.0.0 h1:/6Hmqy13Ss2zCq62VdNG8tM1wchn8zjSGOBJ6icpsIM=
 github.com/jackc/pgpassfile v1.0.0/go.mod h1:CEx0iS5ambNFdcRtxPj5JhEz+xB6uRky5eyVu/W2HEg=
-github.com/jackc/pgproto3 v1.1.0 h1:FYYE4yRw+AgI8wXIinMlNjBbp/UitDJwfj5LqqewP1A=
 github.com/jackc/pgproto3 v1.1.0/go.mod h1:eR5FA3leWg7p9aeAqi37XOTgTIbkABlvcPB3E5rlc78=
 github.com/jackc/pgproto3/v2 v2.0.0-alpha1.0.20190420180111-c116219b62db/go.mod h1:bhq50y+xrl9n5mRYyCBFKkpRVTLYJVWeCc+mEAI3yXA=
 github.com/jackc/pgproto3/v2 v2.0.0-alpha1.0.20190609003834-432c2951c711/go.mod h1:uH0AWtUmuShn0bcesswc4aBTWGvw0cAxIJp+6OB//Wg=