Update dentaku requirement from = 3.3.4 to = 3.4.0

[dependabot-preview]

Updates the requirements on dentaku to permit the latest version.

Changelog

Sourced from dentaku's changelog.

[v3.4.0] 2020-12-07

• allow access to intermediate values of flattened hashes
• catch invalid array syntax in the parse phase
• drop support for Ruby < 2.5, add support for Ruby 2.7
• add support for subtracting date literals
• improve error handling
• improve math function implementation
• add caching for calculated variable values
• allow custom unbound variable handling block at Dentaku module level
• add enum functions ANY, ALL, MAP and PLUCK
• allow self-referential formulas in bulk expression solver
• misc internal fixes and enhancements

[v3.3.4] 2019-11-21

• bugfix release

[v3.3.3] 2019-11-20

• date / duration addition and subtraction
• validate arity for custom functions with variable arity
• make AST serializable with Marshal.dump
• performance optimization for arithmetic node validation
• support lazy evaluation for expensive values
• short-circuit IF function
• better error when empty string is used in arithmetic operation

[v3.3.2] 2019-06-10

• add ability to pre-load AST cache
• fix negation node bug

[v3.3.1] 2019-03-26

• better errors for parse failures and exceptions in internal functions
• fix Ruby 2.6.0 deprecation warnings
• fix issue with functions in nested case statements

[v3.3.0] 2018-12-04

• add array literal syntax
• return correct type from string function AST nodes

[v3.2.1] 2018-10-24

• make evaluate rescue more exceptions

[v3.2.0] 2018-03-14

• add COUNT and AVG functions
• add unicode support 😎
• fix CASE parsing bug
• allow dependency filtering based on context
• add variadic MUL function
• performance optimization

[v3.1.0] 2018-01-10

• allow decimals with no leading zero

Commits

• ba69d2d Release 3.4.0
• b4b73ca add missing inheritance
• 4f4f9fd Merge pull request #228 from rubysolo/self-referential-formulas
• 2cabf61 move rescues to shared method
• e51e6ac make self-referential formulas work
• 0869859 make memory override work
• 3fa112c remove precedence config option
• 74121f4 allow overriding calculator memory with variables
• 7c98f7a add MAP/PLUCK functions
• 57f6623 coerce enum collections into array
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #92.