Update dependencies, fix null checks and scrolling issue

• Merge pull request #103 from sandstreamdev/all-contributors/add-Iliyaz1995 03365ab
• docs: update .all-contributorsrc [skip ci] 04fb5ec
• docs: update README.md [skip ci] ef4657e
• Merge pull request #102 from sandstreamdev/fix_for_issue_90 dbe42d7
• Add overflow style for example app ffee7a1
• Merge pull request #101 from sandstreamdev/update_dev_dependecies 8d94f2d
• Update dev dependecies 20122e5
• Merge branch 'fix_null_exceptions' cdd4614
• Add additional null check 63a3925
• Merge branch 'update_dependencies' 1b50ae4
• Update if statements - remove specific null checks 916e701
• Update dependencies f9a87e1
• Fix null exceptions during drag in some cases fdc2e61
• Merge branch 'update_example_dependency_for_list' 31c2ab8
• Update example dependency for list 8cfd2a1
• Add touch overflow scrolling e895b16

v0.4.0...v0.4.1