Update golang.org/x/crypto, switch to Go modules. (#22)

This change updates golang.org/x/crypto to address #19, while also updating the dependency management system to Go modules.

Author: suyashkumar

.travis.yml

@@ -1,9 +1,8 @@
 language: go
-go: 
-    - "1.10.x"
-    - "1.11.x"
+go:
+    - "1.13.x"
 install:
-    - go get -u github.com/golang/dep/cmd/dep 
+    - go mod download 
 script:
     - make
     - make test

Gopkg.lock

@@ -2,7 +2,7 @@ BINARY = ssl-proxy
 
 .PHONY: build
 build:
-	dep ensure
+	go mod download
 	go build -o ${BINARY}
 
 .PHONY: test
@@ -16,7 +16,7 @@ run:
 
 .PHONY: release
 release: 
-	dep ensure
+	go mod download	
 	GOOS=linux GOARCH=amd64 go build -o build/${BINARY}-linux-amd64 .;
 	GOOS=darwin GOARCH=amd64 go build -o build/${BINARY}-darwin-amd64 .;
 	GOOS=windows GOARCH=amd64 go build -o build/${BINARY}-windows-amd64.exe .;

Gopkg.toml

@@ -0,0 +1,12 @@
+module github.com/suyashkumar/ssl-proxy
+
+go 1.13
+
+require (
+	github.com/davecgh/go-spew v1.1.1
+	github.com/pmezard/go-difflib v1.0.0
+	github.com/stretchr/testify v1.2.2
+	golang.org/x/crypto v0.0.0-20191206172530-e9b2fee46413
+	golang.org/x/net v0.0.0-20191209160850-c0dbc17a3553
+	golang.org/x/text v0.3.2
+)