fixing changelog

Merge pull request flame-engine#271 from flame-engine/develop

0.19.0 RC

Merge pull request flame-engine#263 from flame-engine/develop

0.18.3 RC

Merge pull request flame-engine#244 from flame-engine/develop

0.18.2 RC

Merge pull request flame-engine#217 from flame-engine/develop

0.18.1 RC

Merge pull request flame-engine#214 from flame-engine/develop

0.18.0 RC

Fixing box2d_flame dependency

bump svg dependency and fix example app to call ensure initialized me…

…thod

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