fix(core): update

ts/interfaces/droplets.ts

@@ -0,0 +1 @@
+export type TDropletSizes = 's-1vcpu-1gb';

ts/interfaces/images.ts

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+export type TImages = 'ubuntu-18-04-x64';

ts/interfaces/index.ts

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+export * from './droplets';
+export * from './regions';
+export * from './images';

ts/interfaces/regions.ts

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+/**
+ * An interface describing the available regions
+ */
+export type TRegions = 'ams1' | 'ams2' | 'ams3' | 'fra1' | 'nyc1' | 'nyc2' | 'nyc3';