Avoid forcing allowSyntheticDefaultImports flag

[kibertoad]

When compiling TS, following errors is thrown:

    5 export = picocolors
      ~~~~~~~~~~~~~~~~~~~
    This module is declared with 'export =', and can only be used with a default import when using the 'allowSyntheticDefaultImports' flag.

This makes picocolors not an ideal transitive dependency, as it forces dependant projects to use specific TS configuration, which they may want to avoid.

Are there any strong reasons why export = picocolors export style is used?

[prantlf]

This appears to work with #60. I modified one more file in addition to changes done for testing the TypeScript integration for #59 and building and running worked:

--- a/tsconfig.json
+++ b/tsconfig.json
@@ -4,6 +4,7 @@
     "module": "CommonJS",
     "esModuleInterop": true,
     "forceConsistentCasingInFileNames": true,
+    "allowSyntheticDefaultImports": false,
     "strict": true,
     "skipLibCheck": true,
     "outDir": "dist",