Require Forwardable module

[jschulenklopper]

Not sure whether this is the most proper fix (and fix location), but the Forwardable module is missing from the require statements. That results in an error

/usr/local/lib/ruby/gems/2.5.0/gems/neo4j-9.4.0/lib/neo4j/shared/property.rb:119:in `': uninitialized constant Neo4j::Shared::Property::ClassMethods::Forwardable (NameError)

when including a Neo4j module, as reported in #1535.

Fixes #1535

[codecov-io]

Codecov Report

Merging #1541 into master will increase coverage by 0.16%. The diff coverage is 100%.

@@            Coverage Diff            @@
##           master   #1541      +/-   ##
=========================================
+ Coverage   93.24%   93.4%   +0.16%     
=========================================
  Files         104     104              
  Lines        4724    4810      +86     
=========================================
+ Hits         4405    4493      +88     
+ Misses        319     317       -2

Impacted Files	Coverage Δ
lib/neo4j.rb	97.95% <100%> (+0.02%)	:arrow_up:
lib/neo4j/migrations/schema_migration.rb	88.88% <0%> (-11.12%)	:arrow_down:
lib/neo4j/active_base.rb	88.88% <0%> (-2.03%)	:arrow_down:
lib/neo4j/active_node.rb	95% <0%> (-1.56%)	:arrow_down:
...ib/rails/generators/neo4j/model/model_generator.rb	60% <0%> (-1.37%)	:arrow_down:
lib/neo4j/shared/type_converters.rb	94.71% <0%> (-1.24%)	:arrow_down:
lib/neo4j/active_node/has_n.rb	98.4% <0%> (-0.37%)	:arrow_down:
...o4j/active_node/query/query_proxy_eager_loading.rb	100% <0%> (ø)	:arrow_up:
...4j/active_node/has_n/association_cypher_methods.rb	100% <0%> (ø)	:arrow_up:
lib/neo4j/class_arguments.rb	90% <0%> (ø)	:arrow_up:
... and 28 more

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