fix: delete unused method and update comment

Relates to a related fix done in some other sdks, such as the node one at
Unleash/unleash-client-node#417

In this case, this method appears unused, so we can remove it.

internal/strategies/helpers.go

@@ -78,13 +78,6 @@ type rng struct {
 	random *rand.Rand
 }
 
-func (r *rng) int() int {
-	r.Lock()
-	n := r.random.Intn(100) + 1
-	r.Unlock()
-	return n
-}
-
 func (r *rng) float() float64 {
 	return float64(r.int())
 }
@@ -96,8 +89,8 @@ func (r *rng) string() string {
 	return strconv.Itoa(n)
 }
 
-// newRng creates a new random number generator for numbers between 1-100
-// and uses a mutex internally to ensure safe concurrent reads.
+// newRng creates a new random number generator and uses a mutex
+// internally to ensure safe concurrent reads.
 func newRng() *rng {
 	seed := time.Now().UnixNano() + int64(os.Getpid())
 	return &rng{random: rand.New(rand.NewSource(seed))}