Use SplitN instead of split

fixtures/equals.env

@@ -0,0 +1,2 @@
+export OPTION_A='postgres://localhost:5432/database?sslmode=disable'
+

godotenv.go

@@ -138,7 +138,7 @@ func parseLine(line string) (key string, value string, err error) {
 	}
 
 	// now split key from value
-	splitString := strings.Split(line, "=")
+	splitString := strings.SplitN(line, "=", 2)
 
 	if len(splitString) != 2 {
 		// try yaml mode!

godotenv_test.go

@@ -93,6 +93,15 @@ func TestLoadExportedEnv(t *testing.T) {
 	loadEnvAndCompareValues(t, envFileName, expectedValues)
 }
 
+func TestLoadEqualsEnv(t *testing.T) {
+	envFileName := "fixtures/equals.env"
+	expectedValues := map[string]string{
+		"OPTION_A": "postgres://localhost:5432/database?sslmode=disable",
+	}
+
+	loadEnvAndCompareValues(t, envFileName, expectedValues)
+}
+
 func TestLoadQuotedEnv(t *testing.T) {
 	envFileName := "fixtures/quoted.env"
 	expectedValues := map[string]string{