Using go 1.20 and improving README.md

Author: manuelarte

README.md

@@ -24,7 +24,9 @@ t2 _________|
 tp ____|‾‾‾‾|___
 ```
 
-It also provides a function `Overlaps` to check whether the two time periods overlaps, and what's the overlapping period
+If start time or end time are zero, it means no limit.  
+
+The struct also provides a function `Overlaps` to check whether two time periods overlaps, and what is the overlapping period
 
 e.g.
 

go.mod

@@ -1,3 +1,3 @@
 module GoTime
 
-go 1.22
+go 1.20

pkg/timeperiod/timeperiods_test.go

@@ -42,6 +42,7 @@ func TestTimePeriod_GetDuration(t *testing.T) {
 		},
 	}
 	for name, test := range tests {
+		name, test := name, test
 		t.Run(name, func(t *testing.T) {
 			t.Parallel()
 			actual := test.timePeriod.GetDuration()
@@ -305,6 +306,7 @@ func TestTimePeriod_DoesIntersect(t *testing.T) {
 	}
 
 	for name, test := range tests {
+		name, test := name, test
 		t.Run(name, func(t *testing.T) {
 			t.Parallel()
 			actualResult := test.basePeriod.doesIntersect(test.comparePeriod)
@@ -633,6 +635,7 @@ func TestTimePeriod_Intersect(t *testing.T) {
 	}
 
 	for name, test := range tests {
+		name, test := name, test
 		t.Run(name, func(t *testing.T) {
 			t.Parallel()
 			actualResult := test.basePeriod.intersect(test.comparePeriod)
@@ -682,10 +685,10 @@ func TestTimePeriod_NewTimePeriod(t *testing.T) {
 		},
 	}
 	for name, test := range tests {
+		name, test := name, test
 		t.Run(name, func(t *testing.T) {
 			t.Parallel()
 			_, err := NewTimePeriod(test.startTime, test.endTime)
-
 			if !errors.Is(test.expectedErr, err) {
 				t.Errorf("Expected: %v, Actual: %v", test.expectedErr, err)
 			}