rename `internal` to `pkg`

These components are meant to be consumed by external programs to implement
a terra oracle.

README.md

@@ -4,7 +4,7 @@ A library for implementing a price oracle on the Terra network.
 
 ## Example
 
-See `cmd/example` directory for an example oracle program.
+See `example` directory for an example oracle program.
 
 ## Sponsors
 

example/terra_oracle.go

@@ -7,8 +7,8 @@ import (
 	"github.com/cosmos/cosmos-sdk/types"
 	"github.com/tendermint/tendermint/rpc/client"
 
-	"github.com/certusone/terra-oracle/internal/oracle"
-	"github.com/certusone/terra-oracle/internal/signer"
+	"github.com/certusone/terra-oracle/pkg/oracle"
+	"github.com/certusone/terra-oracle/pkg/signer"
 )
 
 // examplePriceProvider implements the PriceProvider interface

go.mod

@@ -13,3 +13,5 @@ replace (
 	github.com/cosmos/cosmos-sdk => github.com/YunSuk-Yeo/cosmos-sdk v0.34.7-terra
 	golang.org/x/crypto => github.com/tendermint/crypto v0.0.0-20180820045704-3764759f34a5
 )
+
+go 1.13

pkg/oracle/oracle.go

@@ -6,7 +6,7 @@ import (
 	"log"
 	"time"
 
-	"github.com/certusone/terra-oracle/internal/signer"
+	"github.com/certusone/terra-oracle/pkg/signer"
 	ctypes "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/x/auth"
 	tcontext "github.com/cosmos/cosmos-sdk/x/auth/client/txbuilder"