refactor!: remove MinimumLoad() option (#17)

## Description

The `cuckoo.MinimumLoad()` option was not a very useful option, and prone to error. By removing the ability to modify it, and setting it to something reasonable (like 5%), we can remove a whole set of errors that the user may stumble into.

## Changes

- Remove `MinimumLoad()` option.
- Privated `DefaultMinimumLoad`.

### Design Decisions

- `DefaultMinimumLoad` should be privated because it is no longer an option. The user should not need to interact with it.

## Checklist

- [x] Tests pass
- [x] Docs updated

Reviewed-on: #17

settings.go

@@ -12,11 +12,12 @@ const DefaultCapacity uint64 = 16
 // hash table implementations use 2.
 const DefaultGrowthFactor uint64 = 2
 
-// DefaultMinimumLoad is the default lowest acceptable occupancy of a [Table].
-// The value of 5% is taken from [libcuckoo].
+// defaultMinimumLoad is the default lowest acceptable occupancy of a [Table].
+// The higher the minimum load, the more likely that a [Table.Put] will not
+// succeed. The value of 5% is taken from [libcuckoo].
 //
 // [libcuckoo]: https://github.com/efficient/libcuckoo/blob/656714705a055df2b7a605eb3c71586d9da1e119/libcuckoo/cuckoohash_config.hh#L21
-const DefaultMinimumLoad float64 = 0.05
+const defaultMinimumLoad float64 = 0.05
 
 type settings struct {
 	growthFactor  uint64
@@ -38,19 +39,6 @@ func Capacity(value int) Option {
 	return func(s *settings) { s.bucketSize = uint64(value) }
 }
 
-// MinimumLoad modifies the [DefaultMinimumLoad] of the [Table]. The value must
-// be between 0.00 and 1.00.
-//
-// The higher the minimum load, the more likely that a [Table.Put] will not
-// succeed. Minimum loads above 20% are not tested.
-func MinimumLoad(value float64) Option {
-	if value < 0.00 || value > 1.00 {
-		panic(fmt.Sprintf("go-cuckoo: MinimumLoad must be between 0.00 and 1.00, got %f", value))
-	}
-
-	return func(s *settings) { s.minLoadFactor = value }
-}
-
 // GrowthFactor controls how much the capacity of the [Table] multiplies when
 // it must resize. The value must be greater than 1.
 func GrowthFactor(value int) Option {