常数のPIとEを使えるようにしました。

[javecs]

No description provided.

[codecov]

Codecov Report

Merging #48 into master will decrease coverage by 0.29%.
The diff coverage is 70.14%.

@@             Coverage Diff             @@
##             master      #48     +/-   ##
===========================================
- Coverage     71.49%   71.19%   -0.3%     
- Complexity       67       71      +4     
===========================================
  Files             8        8             
  Lines           414      434     +20     
  Branches         42       44      +2     
===========================================
+ Hits            296      309     +13     
- Misses           73       75      +2     
- Partials         45       50      +5

Impacted Files	Coverage Δ	Complexity Δ
...n/java/xyz/javecs/tools/expr/parser/ExprLexer.java	75% <ø> (ø)	6 <0> (ø)	⬇️
.../xyz/javecs/tools/expr/parser/ExprBaseVisitor.java	18.75% <0%> (-1.25%)	3 <0> (ø)
src/main/kotlin/xyz/javecs/tools/expr/BuiltIn.kt	100% <100%> (ø)	0 <0> (ø)	⬇️
...rc/main/kotlin/xyz/javecs/tools/expr/Calculator.kt	84.61% <57.14%> (-10.63%)	12 <3> (+1)
...c/main/kotlin/xyz/javecs/tools/expr/EvalVisitor.kt	39.13% <66.66%> (-1.78%)	16 <1> (+1)
.../java/xyz/javecs/tools/expr/parser/ExprParser.java	72.6% <71.69%> (+0.25%)	25 <0> (+2)	⬆️

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