Fix Issue696 -- Divide by 0 Error when setting rate to 0 manually (#700)

* added check to RateThrottle.ChangeRate() in rate.go to prevent a divide by 0 error when the rate is set to 0. Ref: issue 696: https://github.com/ffuf/ffuf/issues/696

* added name to contributors.md and small change description to changelog.md as requested in PR doc

* Update CONTRIBUTORS.md

---------

Co-authored-by: Joona Hoikkala <5235109+joohoi@users.noreply.github.com>

CHANGELOG.md

@@ -5,6 +5,7 @@
   - Changed
     - Explicitly allow TLS1.0 
     - Fix markdown output file format
+    - Fixed divide by 0 error when setting rate limit to 0 manually.
   
 - v2.0.0
   - New

CONTRIBUTORS.md

@@ -14,6 +14,7 @@
 * [Daviey](https://github.com/Daviey)
 * [delic](https://github.com/delic)
 * [denandz](https://github.com/denandz)
+* [Ephex2](https://github.com/Ephex2)
 * [erbbysam](https://github.com/erbbysam)
 * [eur0pa](https://github.com/eur0pa)
 * [fabiobauer](https://github.com/fabiobauer)
@@ -47,4 +48,3 @@
 * [SolomonSklash](https://github.com/SolomonSklash)
 * [TomNomNom](https://github.com/tomnomnom)
 * [xfgusta](https://github.com/xfgusta)
-

pkg/ffuf/rate.go

@@ -65,7 +65,12 @@ func (r *RateThrottle) CurrentRate() int64 {
 }
 
 func (r *RateThrottle) ChangeRate(rate int) {
-	ratemicros := 1000000 / rate
+	ratemicros := 0 // set default to 0, avoids integer divide by 0 error
+
+	if rate != 0 {
+		ratemicros = 1000000 / rate
+	}
+
 	r.RateLimiter.Stop()
 	r.RateLimiter = time.NewTicker(time.Microsecond * time.Duration(ratemicros))
 	r.Config.Rate = int64(rate)